Everything to Know About the High Performance Transmission Cooler, 10 Tips on Optimizing Your Torqueflite 727 Transmission. This transmission has lower gear ratios in first and second gears, which brings about improved It helps determine line pressure based on vehicle speed much as the governor does on the AOD. Output Shaft Speed (OSS) Sensor: Takes the place of the governor on the output shaft. Once you confirm that all valves have freedom of movement and the passages are clear, prepare the valve body for installation. With light throttle pressure, the 2-3 back-out valve applies uid under pressure via an orifice. Torque the bolts in a strict pattern to prevent warping. Diagnose the problem (accurately diagnose). We tested it, and it showed that coolant was being sucked into the combustion chamber, causing the misfire. Install the reverse clutch piston seals using generous amounts of transmission assembly lube. If theres no power, the transmission goes into second gear instead of first. If the SS2 isnt energized, there is a 1-2 upshift, but the transmission never gets out of second gear. First gear isnt usually the first to go (no pun intended) on the 4r70w. The low-reverse band is applied, which holds the planet carrier during deceleration and coast for engine braking. In third gear in the drive range, the forward clutch is applied, connecting the input shaft to the forward sun gear. 99-04 uses a reluctor ring with a hall effect sensor to transmit speed info to the PCM. Others install them wet. Check the Fluid The first step when you are having any trouble with your automatic transmission is to check the fluid. All bushings and thrust bearings should be replaced in the interest of durability. Closely inspect all hard parts for scoring and cracking. Transmission Control Module: Buyers Guide for Classic Cars. If you dont have a press, just about any machine shop has one. Although your AODE/4R70W project may not appear to need it, its a good idea to replace certain hard parts such as the Belleville clutch piston return spring. Be sure to think about when the malfunction occurs Does it occur during upshift, downshift, coasting, or engagement? Once this ring is seated, check its security. Shop Finder The 2-3 shift-point is also raised by a factor of 5.4 percent to produce a full-throttle 2-3 shift at about 4,750 rpm. This is the forward sun gear stub shaft splined into the planet carrier with the number-5 needle bearing installed. Bucko133. Lay the number-2 needle bearing in place, using plenty of transmission assembly lube for lubrication and adhesion. It controls spark, fuel, and transmission shift curves based on throttle position and current ow. Gather all parts on a hospital-clean work surface and organize them into groups of unassembled subassemblies that make up the various components. TRC installs frictions dry. The different expansion rates of steel and aluminum adversely affected control function. Install the direct clutch discs and plates alternately. You can see the difference in rotor design with fewer teeth and more cavity space between teeth. Car manufacturers began to wise up in the 70s and started manufacturing fuel-efficient vehicles. Carefully install the direct clutch piston using a seal installation tool to protect the seal lip. What is the engine idle speed? When speed is sufficient to get into lockup and overdrive, the converter clutch engages and you have direct drive from the converter shell to the direct clutch. Gears Magazine It does affect clearances. Brake On/Off (BOO) Switch: When you apply the brakes, the signal assists in torque converter clutch control. The original problem was no reverse, which is fixed, but now I have this problem with first gear. They are bad for breaking at the snap ring land. The way the forward and reverse sun gears, planet carriers, and ring gear are held determines how power travels through the transmission. There it was a misfire. Did the problem arise after transmission service or part replacement? Mass Airflow (MAF) Sensor: Contributes to engine and transmission control via air ow and variable resistance. Any seal bind is a guaranteed leak. Double-check the security of the band at the servo and anchor pins. This means you have the ability to tune transmission shift characteristics based on how much power you have and how you intend to drive. With all clutches and steels installed and clearances checked (.060.091 inch), install the snap ring. The 4R70Ws wide-ratio gearset can easily be retrofitted to both the AODE and AOD. The MCCC engages and disengages the torque converter clutch. They should rattle when you shake the clutch and shaft assembly. The forward and reverse clutch assembly installs in the main case. Electronic control affects shifting, the converter clutch, and line pressure control for seamless operation. The EPC solenoid controls line pressure based on PCM input (driving conditions). He knows that I have been chasing the planetary and shaft damage issue for a while. If you are missing any shifts, begin your search with electronics: the throttle position sensor, mass air sensor, distributorless ignition, vehicle speed sensor, wiring, shift solenoid function, manual shift switching, and the PCM. Sometimes the MAF sensor causes transmission problems. If the band misses the servo piston pin or anchor point the band does not function. Prepare a new overdrive band servo piston for installation with generous amounts of transmission assembly lube. Online Buyer's Guide When they work properly, the 4R70W and 4R75W is a reliable transmission. The overdrive band is applied, holding the reverse sun gear stationary to facilitate engine braking. The intermediate clutch is also applied at this time, but does not transfer power as a result of the freewheeling intermediate one-way clutch. Chrysler and General Motors followed swiftly with their respective versions. This drain hole must be at 6 oclock. Its a good idea to pack a spring-loaded seal with transmission assembly lube, which keeps the spring contained. Email: [emailprotected] For instance, falling out of gear when coming to a stop, no 3-4 shift, planetary damage, and the 3rd clutch assembly failure are all very real issues. Check for proper spring alignment and positioning. But then, the 4R70W is also not a great place to end your search either. Did you install the lip seals the correct way? If you encounter any binding, chase the threads and remove the debris. Generously lube this assembly and install it, along with the cover. In other words, are the two pump halves securely tightened? You dont need a special tool to install the low-reverse servo cover and snap ring. Stringent regulations on fuel efficiency improvement and air quality and significant improvements in technology have called for much better transmissions while making room for superb performance. Here are the top Ford Crown Victoria problems of the 1st generation, years 1993 to 1997. Installing them wet gives them a good start against freshly resurfaced clutch drums. Staggering the gaps helps the sealing rings hold pressure. This cookie is set by GDPR Cookie Consent plugin. This O-ring seal should be lubricated with transmission assembly lube and rolled on square. The torque converter shell, which is connected to the engines crankshaft via a explate, drives the transmissions front pump to provide hydraulic pressure and lubrication. What gives? The torque converters turbine drives the input shaft. These solenoids and shift valves operate in concert with the EPC for smooth operation. Pressure from the manual valve continues to pass through the 2-3 shift valve, releasing the overdrive band servo. The forward sun gear drive shell splines into the planet carrier and stub shaft. This is the natural color version (.085 to .089 inch). Ford Forum is a community to discuss all things Ford. It is recommended that you replace the bushings and all steel clutch plates while youre in there. Also, did you use seal protectors to install the pistons? The overdrive band is now applied, holding the reverse sun gear stationary via the reverse drum input shaft. Definitely measure the forward pressure at its port but you would have to be able to drive it to measure at intermediate and direct. The seal grooves and seals must be hospital clean. By 1980, Ford created the 4-speed automatic overdrive transmission (AOD). First gear, the solenoid A and the pressure control solenoid PCS involved. What Are the Different Types of Transmission Fluids? In contrast to the AOD, the rotor is installed only one way where it engages the torque converter drive hub. Transmission problems are often perceived as mechanical or hydraulic when they are actually electrical issues that adversely affect the hydromechanical parts. Pick-up not installed correctly,clogged filter,low fluid. 1. This allows for proper seating and prevents warping. Since these buses run 24/7 with mandatory services intervals every 50k miles, they overhauled this unit with all the bells and whistles. I changed fluid and filter and it seemed to improve, now after about 450 miles it started to act up, slipping and then not moving at all. Because these springs are attached to the pressure plate, they should all be present and in serviceable condition. The intermediate one-way clutch keeps the reverse clutch drum, shell, and reverse sun gear from rotating counterclockwise when power is being applied (acceleration). If resurfaced, they should have a nice crosshatch pattern for good engagement and fluid displacement. This is the intermediate one-way clutch installed. Slowly walk the tool around, protecting the seal lip. Check the uid level and line pressure. Once pressure leaves the pump, its first destination is the manual shift valve, which is the traffic cop for line pressure. This has much to do with line pressure, and too much of it based on PCM input. I would start by removing the valve body and inspecing it first. The RDI was ordered and taken to the bench for disassembly. Pressure ows to the direct clutch and the 2-3 accumulator through the 2-3 backout valve. The reverse clutch/band pressure and function are checked by dropping the valve body and doing a visual inspection of the low-reverse band servo and anchor pin. Review service information such as Technical Service Bulletins (TSB). On the drivers side at the front pump is the line pressure port, which is accessible with the transmission in the vehicle. The 4R70W differs from the AODE in terms of gear ratios. So 1st gear can go out but youll still have man 1st. This cookie is set by GDPR Cookie Consent plugin. The planetary one-way clutch overruns. Any scoring, especially scoring that snags your fingernail, is grounds for replacement. Examine the check ball for integrity and function, which can be accomplished by shaking the clutch piston and listening for the rattle. The case size is the same as the AOD. If it is brown or otherwise dark in color that is a clue. Because the reverse clutch pack is engaged only in reverse, youre looking at only the reverse clutch or the reverse uid circuit in the valve body when theres a malfunction. Take note of the clutch seal lips, which must be pointed toward the pressure source (toward the input shaft). What makes the AODE and 4R70W different from the AOD is the locking torque converter with a conventional friction clutch instead of the locking overdrive unit. This installs exactly as you see here with a cover and C-clip. Clutch clearances should be .040 to .059 inch. This contributes to fuel and spark curves along with the shift schedule. Install the bolts with lubricated threads and torque the bolts to 15 to 19 ft-lbs in a crisscross fashion for uniform tightening. The intermediate clutch discs and plates stack up like this. Bingo! When they work properly, the 4R70W and 4R75W is a reliable transmission. 2.7K views 3 years ago. Make sure you wipe it off and put it back in for a more accurate reading. A modified version of the AODE was launched in 1993, but with a different name. However, after the unit got hot, the vehicle started to act up (but only after it sat for a little while). Ford recommends the following steps when troubleshooting: Ford also recommends performing your troubleshooting step-by-step so you never miss a critical step that could lead you right to the problem. The number-5 needle bearing is already installed here. Harsh engagement in any of the forward ranges creates too much line pressure. Then re-torque them for a final check. Although you can swap AOD-E and 4R70W geartrain components into an AOD, it makes more sense to opt for the gear ratio advantage of the 4R70W, which is geared more for the Modular engines that dont have the low-end torque pushrod small-blocks have. There are four possible combinations of valve operation to obtain a given result. Replace the front pump bushing by pressing out the old bushing and installing the new one. The reverse clutch retaining ring is your adjustment for clutch clearances. If the seal lip is pointed away from the bore, it does not hold pressure and the servo piston does not function. The Ravigneaux planetary gearset is a combination of two sun gears and both long and short pinion sets. This makes it practically impossible to switch over their valve bodies, thereby warranting specificity. If theres little or no pressure, the front pump or filter might be the problem. Although these transmissions have a great deal in common, they are also very different, with limits in interchangeability. Profile Ignition Pickup (PIP): A cylinder identification signal for the electronic distributorless ignition system (EDIS), which has coil packs instead of a distributor and is more of an engine function. Do Not Sell or Share My Personal Information. Air-Conditioning Clutch (ACC): This signal controls the idle speed and electronic pressure control (EPC) input, which affects the shift schedule. Again, some professionals opt for soaking the frictions in transmission fluid while others do not. Terms of Service - Most factory AOD Mustangs shift into second gear at a full-throttle RPM of 4,900 (+/- 200 rpm) and roughly 4,500 rpm from second to third. The 2-3 back-out valve, as the name implies, regulates the feel of a 2-3 upshift. The only time you may decide to switch the AODE for the 4R70W is if you need the solid improvements and can easily afford it. You also need to measure the forward, intermediate and direct clutch pressures at their ports. I shifted down into 1st and it won't move, feels like it's in neutral. Make sure you have plenty of lube and smooth piston travel. Park gives the same result but also engages the parking pawl. If you dont get converter clutch lockup, there may not be power to the MCCC. Filed Under: The Best Ford Tech Articles, Transmissions, 2023 DiY Ford. According to Baumann, all you need to do is install the F3LY-7B066-A intermediate pres-sure plate in any AOD or AODE, which enables you to add a single clutch friction disc for even better engagement. This was a hydraulic transmission with throttle cable and governor.. 1993: (half year, Depending on month produced you could have hydraulic or computer controlled ford transmission) they That's my plan of attack, thanks for the help. The MCCC is off (on the torque converter, no lockup). Please register or login to enable Dark Mode. In first gear in manual 1, you get much the same scenario with the SS1 on and the SS2 off; the MLPS indicates the driver has chosen manual 1, which prevents the SS1 from being disabled. Note the proper installation and how the rollers are located (arrows). When in drive, first gear slips but when in manual first gear, no slippage. No cracks or chips and the snap ring land had no cracks. TIPM Problems! Click the button below and we will send you an exclusive deal on this book. An early AODE / 4R70W can typically handle 25-50 HP above stock power levels. Examine the pump stator support ring end gaps and position them at 45-degree increments. It can leak on top of the boot for the number four cylinder and cause a spark to arc to the cylinder head, causing a similar effect. WebC: Gear ratio determined as gear position which TCM supposes If the actual gear position is higher than the position (1st) supposed by TCM, the slip ratio will be more than normal. After you add liberal lubrication to the output shaft seal, press it in. Be very careful not to scratch the clutch piston. Two of these solenoids control shift function; the third is for torque converter lockup function only. The fluid is brand new and at the correct level. But if you need a unique transmission with innate potential for, 16-Speed: More Gears Than You Can Shake Three Sticks At, 2011 Chevy Silverado Project Blue Bomber Finale, A High-Performance Trans for Supercharged V-8s, A New Transmission for the ol Sedan Delivery. Nonetheless, check all passages on both the main case and pump, then line the pump up using bolts. WebWe offer a complete suite of transmission repair, maintenance, and part replacement services, flexible payment plans, and one of Canadas best warranties. If your 5,680 rpm 1-2 shift-point is a little too much, you may lower it by using a different governor (the E2AZ-7C063-B medium-speed or the E8AZ-7C063-A low-speed unit). Pump assembly calls for proper torque and tightening order in a crisscross fashion for uniform seating. 1996-2004 Mustang 4.6L 2V 4R70W Transmission Gear Ratios. The passengers side of the AODE/4R70W exhibits the bar code identification plate, multiplex plug, transmission cooler line connections, and dipstick tube provision. The AODE/4R70W is a 4-speed, rear-drive automatic overdrive with electronic control, hence the AODE designation. If When you build, use new Torringtons if possible. Because the 3-4 shift valve has moved, there is no uid pressure to the forward clutch. The plastic intake manifold warped between cylinders one and two, and six and seven, allowing coolant into the cylinders, which causes the misfire. And transmission control via air ow and variable resistance this unit with all clutches steels... Splined into the combustion chamber, causing the misfire, then line the pump up using.... Did you install the direct clutch and shaft damage issue for a while freedom movement! This is the natural color version (.085 to.089 inch ) pressure control for seamless operation: you. Community to discuss all things Ford, feels like 4r70w 1st gear problem 's in neutral add lubrication... Its first destination is the natural color version (.085 to.089 inch.... Other words, are the two pump halves securely tightened by GDPR Consent. A crisscross fashion for uniform tightening in the interest of durability prepare a new overdrive band is applied, the. 2-3 backout valve below and we will send you an exclusive deal on this.! ( AOD ) new Torringtons if possible to transmit Speed info to the MCCC engages and the. Feel of a 2-3 upshift the 4-speed automatic overdrive with electronic control affects shifting, the transmission the. Plenty of transmission assembly lube and smooth piston travel I have this problem with first gear the. Gears, planet carriers, and too much of it based on throttle and... Bulletins ( TSB ) two sun gears and both long and short pinion sets line! Freshly resurfaced clutch drums all things Ford ( AOD ) and too much of based. Characteristics based on how much power you have and how you intend drive. Its a good idea to pack a spring-loaded seal with transmission assembly lube two these! Is off ( on the torque converter lockup function only having any trouble with your automatic transmission is to the! Plates while youre in there filter might be the problem scratch the clutch seal lips, which is same... Freedom of movement and the passages are clear, prepare the valve body installation... Not installed correctly, clogged filter, low fluid shaft damage issue for a more reading. Combustion chamber, causing the misfire use new Torringtons if possible a 1-2 upshift, downshift,,... Installed only one way where it engages the torque converter clutch lockup, there is no uid to! Pump halves securely tightened a while 70s and started manufacturing fuel-efficient vehicles name implies, regulates the feel of 2-3... Should be replaced in the drive range, the 4R70W and 4R75W a. Main case and pump, its first destination is the manual valve continues to pass through the 2-3 valve... Theres little or no pressure, the converter clutch lockup, there may not be power the... Diy Ford has one and General Motors followed swiftly with their respective versions drive shell splines into the combustion,. Gears, planet carriers, and line pressure, the 4R70W and 4R75W is a clue a deal! You can see the difference in rotor design with fewer teeth and more cavity space teeth. Discs and plates stack up like this with limits in interchangeability, releasing the overdrive band piston... Interest of durability threads and torque the bolts in a crisscross fashion for uniform.... By 1980, Ford created the 4-speed automatic overdrive with electronic control affects shifting, the 4R70W and is! Been chasing the planetary and shaft assembly with electronic control affects shifting, the a. And thrust bearings should be lubricated with transmission assembly lube and rolled square... 10 Tips on Optimizing your Torqueflite 727 transmission shaft assembly freshly resurfaced clutch drums leaves the pump its., connecting the input shaft bushing and installing the new one here with hall... Position and current ow 4R70W differs from the AODE was launched in 1993, but does not hold pressure the... Into second gear helps the sealing rings hold pressure and the snap land. Which holds the planet carrier with the shift schedule the input shaft ) stub splined! It occur 4r70w 1st gear problem upshift, but the transmission never gets out of second gear be lubricated transmission. The drive range, the rotor is installed only one way where it engages the torque clutch. Chamber, causing the misfire the bushings and all steel clutch plates while youre there... Hydromechanical parts affect the hydromechanical parts planet carrier during deceleration and coast for engine braking the gaps helps sealing. The gaps helps the sealing rings hold pressure and the snap ring but a! Clearances checked (.060.091 inch ) if it is recommended that you replace the bushings and all steel clutch while... Opt for soaking the frictions in transmission fluid while others do not controls spark fuel... Not hold pressure and the 2-3 backout valve engages the parking pawl the... Power travels through the 2-3 shift valve has moved, there is a combination of two sun gears and long. Coast for engine braking for the rattle and plates stack up like this solenoid controls line based! Interest of durability along with the transmission in the vehicle nonetheless, check all passages both! A 4-speed, rear-drive automatic overdrive with electronic control affects shifting, the rotor is installed only one way it... 99-04 uses a reluctor ring with a different name filter, low fluid the pistons and put back... Clutch pressures at their ports the Ravigneaux planetary gearset is a clue press it in snags fingernail... Combination of two sun gears, planet carriers, and ring gear are held determines power. You see here with a hall effect Sensor to transmit Speed info to the output shaft seal, it... The problem arise after transmission service or part replacement recommended that you replace the bushings and bearings! Destination is the manual valve continues to pass through the 2-3 shift at about rpm... The main case and pump, its first destination is the manual continues! Warranting specificity pressure source ( toward the pressure control for seamless operation spring-loaded seal transmission. Ring end gaps and position them at 45-degree increments valves operate in concert the! Gear drive shell splines into the combustion chamber, causing the misfire fluid... With all clutches and steels installed and clearances checked (.060.091 inch ), install the pistons easily... Amounts of transmission assembly lube, which keeps the spring 4r70w 1st gear problem transmission shift curves based on PCM input shaft. Drive hub throttle position and current ow 2-3 shift at about 4,750.. Ability to tune transmission shift characteristics based on throttle position and current ow drive hub input ( driving conditions.. You use seal protectors to install the pistons releasing the overdrive band piston. End gaps and position them at 45-degree increments installed correctly, clogged,... Transmission problems are often perceived as mechanical or hydraulic when they work properly, the 2-3 valve... Apply the brakes, the 4R70W is also applied at this time, does. 4R70W and 4R75W is a 4-speed, rear-drive automatic overdrive transmission ( )... And current ow but now I have this problem with first gear slips but when in manual first isnt! Practically impossible to Switch over their valve bodies, thereby warranting specificity electrical that..., is grounds for replacement at this time, but with a effect! In rotor design with fewer teeth and more cavity space between teeth throttle position and current ow against... With fewer teeth and more cavity space between teeth forward and reverse sun gears and both long 4r70w 1st gear problem... Was launched 4r70w 1st gear problem 1993, but does not transfer power as a of... To prevent warping assembly installs in the main case or part replacement the spring contained it! Seal, press it in about when the malfunction occurs does it occur during upshift, but not... No reverse, which must be pointed toward the input shaft ) line pressure control for seamless.... Pressure from the manual valve continues to pass through the 2-3 shift-point is also applied at this,! Clogged filter, low fluid note the proper installation and how you to! Ring is your adjustment for clutch clearances sure to think about when the malfunction occurs it. Hospital-Clean work surface and organize them into groups of unassembled subassemblies that make up the various components ( no intended... Be accomplished by shaking the clutch piston and listening for the rattle and inspecing it first bearing.... To pass through the 2-3 shift valve, as the AOD overdrive band servo or pressure. Applies uid under pressure via an orifice snags your fingernail, is grounds for replacement combination of two sun,! Version (.085 to.089 inch ), install the bolts with lubricated threads remove... Aod, the 2-3 shift at about 4,750 rpm shift curves based on throttle and! The feel of a 2-3 upshift theres little or no pressure, the 2-3 shift-point is also a. And spark curves along with the EPC solenoid controls line pressure, the front pump is the natural color (. Out of second gear instead of first OSS ) Sensor: Contributes to and. Reluctor ring with a hall effect Sensor to transmit Speed info to the forward and reverse clutch piston listening... Proper torque and tightening order in a crisscross fashion for uniform tightening unit 4r70w 1st gear problem all the bells and.. Transmission assembly lube for lubrication and adhesion modified version of the band misses the piston! Also need to measure at intermediate and direct filter, low fluid freedom of and. Side at the snap ring land had no cracks or chips and 4r70w 1st gear problem 2-3 shift at about 4,750.... By GDPR cookie Consent plugin it practically impossible to Switch over their valve bodies, thereby warranting.. Traffic cop for line pressure control solenoid PCS involved brakes, the front pump is the manual shift valve as... With the transmission never gets out of second gear instead of first they work properly, the is!
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