The different expansion rates of steel and aluminum adversely affected control function. Your Fords EEC-IV and EEC-V processor conducts the orchestra that is your AODE/4R70Ws hydraulics. Note the proper installation and how the rollers are located (arrows). Another item we never think of while troubleshooting is what we cannot see that affects the PCMs performance: electromagnetic interference, a close lightning strike, nearby electrical equipment, and even your cell phone or other electronic device. What gives? Plus I think man 1st is achieved via activating both the forward and reverse clutches so it spreads out the load. Reproduction in whole or in part without permission is prohibited. If you place the selector into gear and there is no engagement in any gear, the first thing you need to do is check the uid level. This is the intermediate one-way clutch, which is mounted on the reverse clutch drum, allowing rotation one way but not the other. Any seal bind is a guaranteed leak. The extension housing gets this silicone-lined gasket on the extension housing prevents leaks. The 4.6L V-8 needs the 2.84:1 and 1.55:1 1-2 shift to get these engines into their power bands for brisk acceleration. Gather all parts on a hospital-clean work surface and organize them into groups of unassembled subassemblies that make up the various components. Change Your Address, Yes, I would like to receive emails from Gears Magazine. The transmission must be removed to check torque converter function. SS1 and SS2 Shift Solenoids: Shifting is controlled by the operation of one or both of these solenoid valves. The other four thickness options are green (.050 to .054 inch), yellow (.068 to .072 inch), red (.102 to .106 inch), and blue (.119 to .123 inch). Is it a noise or vibration? It is unknown how many cycles a Belleville spring can take before it breaks. Click the button below and we will send you an exclusive deal on this book. You can copy and paste this link to share: https://www.diyford.com/ford-aode4r70w-guide-calibration-building-troubleshooting/. Stub shafts and gears should be inspected for wear issues and replaced as necessary. If theres little or no pressure, the front pump or filter might be the problem. The next items to check are the number-3 and number-4 sealing rings. Generously lubricate the seal lip with assembly lube. Once you have established the intermediate clutch clearances, which are 1.634 to 1.636 inches from the pump mating surfaces to the pressure plate, install the front pump gasket. Shift up to 2nd and it moves forward just fine, same in Drive. When you build, use new Torringtons if possible. Mass Airflow (MAF) Sensor: Contributes to engine and transmission control via air ow and variable resistance. Bathe the clutch discs, plates, and thrust bearings in transmission fluid or assembly lube. JavaScript is disabled. 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. Pump assembly must be performed meticulously with clearances checked. These Vehicle Speed Sensor (VSS): A magnetic pickup (Hall Effect) that works with the OSS to fine-tune transmission function. In manual 1 mode, low-reverse servo applies the low-reverse band at the back of the main case. Closely inspect all hard parts for scoring and cracking. But if you need a unique transmission with innate potential for overwhelming performance and zero need to mess with disagreeable old-school controls or throttle valve cables, the 4R70W remains an excellent place to start. We went on the road test, and the unit worked great. Check out our discussions on the Ford Escape, Mustang, Edge, F-150, Raptor, Explorer, Focus, Fusion, Fiesta and more! What is the engine idle speed? In third gear in the drive range, the forward clutch is applied, connecting the input shaft to the forward sun gear. Use plenty of lubrication on the center support bushing. To get a better understanding of how the processor controls your AODE/4R70W transmission, heres an explanation of what happens. Parts: 330-434-0104 Pressure causes the lip to seal. Since the coolant level and pressure went down so fast, we had to figure out where the coolant went. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Does the engine stall when the transmission selector is placed in gear? Twist and wiggle the stub shaft and feel for proper seating. The detent cam and roller hold the manual shift control in a given position. Nevertheless, both transmissions are interchangeable. If the SS1 solenoid remains energized or the 1-2 shift valve sticks, you dont get a 1-2 upshift. Of course, like every transmission out there, they have their common concerns. As with the AOD, the AODE and 4R70W have a Ravigneaux compound gearset employing two sun gears and a dual-pinion planetary to give you four forward speeds along with reverse gear. SCT tunes (no trans pressure increase) and a tugger valve body kit installed. I did not do much with the valve body, I'm wondering if that could be the problem, like maybe a sticking valve? On on older transmission I would say that the symptoms sound like fluid starvation. If you forget to install this spring, you will find out quickly why Ford calls it an anti-clunk spring. Fuel efficiency, along with wear and tear, improve with low-friction Torrington needle bearings. This requires careful twisting and turning until the clutches and hub fully mate. WebSHORT PROBLEMS (4 problems 22 points total) Partial credit may be given. Next, we suspected the intake manifold. There are other reasons for low line pressure as well, such as damage to the number-6 shuttle ball, 1-2 accumulator seals, manual shift valve, main pressure regulator valve, and number-1 and number-2 seal. The 4R70W arrived at the scene with the following specs: The gear ratios of the 4R70W transmission are: The respective gear ratios of the AOD are: You can see the difference in gear ratios when you compare them side by side. After you add liberal lubrication to the output shaft seal, press it in. Check the pressure plate for freedom of movement in the clutch drum. An OB5 Transmission With Issues Inside AND Outside, On The Move With The ProMaster M40MTA Or Not! With the shifter in reverse, line pressure goes to the reverse clutch pack and low-reverse band servo. Theyre either on or off or on/off in a duty-cycle (pulse) pattern. Fourth gear in overdrive range has both the SS1 and SS2 on. Accelerating those 20 mph in 1st gear instead of 2nd gear would get me faster time, but for that, I need to stop the slip by engaging the TCC. Although the automatic overdrive transmission was relatively new, it still bore several features of old designs. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. Transmission Control Module: Buyers Guide for Classic Cars. It sounds like the clutches are going. 1998 and later 4R70Ws can handle up to 500 HP with Overloading the 4R70W transmission is a bad idea. Because the SS1 is powerless, the 1-2 shift valve allows pressure to flow to the intermediate clutch pack and 1-2 shift accumulator. Reply Like 09-14-2017, 12:01 PM We tested it, and it showed that coolant was being sucked into the combustion chamber, causing the misfire. If you dont have a press, just about any machine shop has one. The planetary one-way clutch stops the planet carrier from turning counterclockwise when power is applied under acceleration, yet it allows rotation in one direction during deceleration and coast. Prepare a new overdrive band servo piston for installation with generous amounts of transmission assembly lube. WebThe 4R70W/4R75W transmission is susceptible to issues that include: loss of forward gears, intermediate clutch failure, loss of second gear, delayed reverse or shudder in reverse, If it is brown or otherwise dark in color that is a clue. Park gives the same result but also engages the parking pawl. One planetary member is driven while the other is held. Do not take shortcuts. PS. This is the forward sun gear stub shaft splined into the planet carrier with the number-5 needle bearing installed. As with the AOD, the AODE and 4R70W have a Ravigneaux compound gearset employing two sun gears and a dual-pinion planetary to give you four forward speeds along with reverse gear. There are two bands, two one-way clutches, and four friction clutches used to lock and drive the gearsets. When line pressure is applied to this servo piston, it engages the low-reverse band. These are the front pump stator support iron sealing rings, which are like piston rings in an engine. If you dont have access to fresh clutch plates, inspect and resurface existing plates. Pay close attention to the seal status. Others install them wet. For example, the Baumann ReCalPro Valve Body Recalibration Kit works very well for shift improvement and durability, resulting from increased line pressure that ensures firm clutch and band engagement without destructive slippage. This is the number-8 needle bearing at the direct clutch, which shoulders the thrust load at the output shaft ring gear. Did the problem arise after transmission service or part replacement? If you point the seal lip in the wrong direction, it does not hold pressure and the clutch pack does not work. Lots of metal at the magnet means hard part wear and tear, which calls for close inspection of the bushings, shafts, gearset, and more. These sealing rings must be well lubricated for pump installation. If the seal lips are pointed away from the pressure source, the clutch cylinder does not maintain pressure and does not function. The forward sun gear drive shell rides against the number-5 needle bearing. Brief History of the Ford 4R70W Transmission, As mentioned earlier, no stock transmission is perfect in every aspect. Sometimes the MAF sensor causes transmission problems. But then, the 4R70W is also not a great place to end your search either. Where it differs is the torque converter clutch in lockup to the direct clutch, planetaries, and output shaft. The drivers side has the manual shift linkage. Make sure it remains centered during installation. And that is why you should know what it can and what it cant do. If you manage to get through gears 1, 2, and 3, a transmission that fails to make overdrive (fourth gear) is not an electrical issue. 2001 Expedition, 4.6L engine, 4R70W transmission. In third gear in overdrive range, the SS1 is off and the SS2 is on. This cookie is set by GDPR Cookie Consent plugin. The assumption here is that the snap ring on the overdrive servo has broken which is a common issue in the 4R70W transmission. The first step would be to remove the pan and valve body to see if the snap ring has shattered and if the overdrive servo has fallen out. The forward drum as far as I can tell looks to be in perfect shape.

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