There's been lots posted on here previously. In park, the driveline will be locked as explained above. These changes have been incorporated on A-904s and 727s since 1966. These kits, when used as directed, were helping to eliminate a lot of premature failure of severe service transmissions. Using this planetary only gives one turn to the output shaft for every 2. It supports the low-reverse drum, the governor-output shaft assembly, and it directs oil to and from the rotating governor weights The governor works with the throttle pressure circuit to control shift points. A factory representative was to observe the disassembly.
Rated to handle up to 750 horsepower. When the sun gear and the front annulus gear spin at the same speed the planet carrier has to rotate at that speed gear train rules dictate that when two members of the same gear rotate at the same speed, the whole gear set rotates at that speed. A life-long gearhead, Street Tech Magazine founder and editor Jefferson Bryant spends more time in the shop than anywhere else. When the Torqueflite shifts from 1st to 2nd, the kickdown band locks around the Front Clutch Retainer to stop the sun gear driving shell. There could have been other, similar failures, but the timing seems strangely related. With the sun gear held and the annulus rotating, the planet carrier is spinning at a reduced speed.
The top right corner contains all the Servos, Bands, Operating levers and pins, and the Accumulator and its spring. To make the 2-3 shift, the kickdown band has to hold until the front clutch is applied and then it has to be quickly released. Elapsed times under 10-seconds will make this car too quick to run in the Pro, or foot-brake bracket classes, so in order to be prepared to run in Super-Pro, a trans-brake is necessary. Finished off with a deep sump pan and complete dyno testing by Performance Automatic professionals. The most common complaint after modification is due to improper product selection I use only modification kits from a company called Transgo in El Monte, California. Once the plates and discs are locked in the rear clutch assembly, power can be transmitted through the input shaft, to the locked clutch-pack and to the front annulus gear see planetary assembly photo. Take it to them and a few weeks later they call with concern about price to rebuild.
If it wasn't for the fact that tires were a lot slicker then, there probably would have been an incredible amount of additional parts breakage. Low gear is a combination of the front and rear planetary sets, so the low-reverse drum has to be stationary to hold the rear planet carrier. These kits include transmission, torque convertor, dipstick, and transmission mount. The output shaft is shown with its thrust washer on the left; it prevents wear between the input shaft and the output shaft. Moving to the top of the photo again, is the low-reverse lever assembly, its adjustment screw and lock nut, the reverse lever shaft and O-ring that the lever assembly pivots on and the rectangular strut that applies the low-reverse band. Hand has built, raced, and written about TorqueFlites and was fortunate to have grown up in a drag racing family as the eldest son of the famed Pontiac expert Jim Hand. If you're contemplating a trip inside a TorqueFlite, this book is your companion.
When the shift lever is placed in drive, the rear clutch drive plates rotate the front annulus gear pinions which then spin the sun gear in a reverse direction. Along with application of the front clutch, fluid is directed to the low-reverse servo, which locks the low-reverse band tightly around the low-reverse drum-rear planet carrier assembly. Pressure forces the lip seals against their surfaces and pushes the piston away from the clutch hub and applies force to the clutch pack through the Belleville spring-pressure plate assembly. I am wanting to build a awesome auto transmission with reverse manual valve body for a large horsepower big block stroker motor with taller gears to enjoy the auto like a four speed without the need for a clutch, due to needing a knee replacement on my left knee. Keep putting out an incredible product! It is made up of the pump body, two rotors, and the reaction shaft support.
Part two by Tom Hand - modification This is the second part of a three part series devoted to the Chrysler Torqueflite Automatic Transmission. This increases the nitrogen content in the metal, giving it better wear and fatigue resistance to the tune of 200-500% over standard steel. Servos- The forward and reverse servos in the 727 are particular weak points. If you're thinking about the hard core performance stuff, check out this company:. Then the front clutch is applied, which locks on to the front clutch hub-input shaft assembly.
I'll give my recommendations shortly. However, if you don't have huge horsepower, I might suggest: Master overhaul kit with Alto friction plates. No real problems were noted by changing to the smaller unit except for 1978 early lock-up shuddering, remedied by delaying the lock-up speed a few mph later that model year. The higher numbered levers multiply the apply force more to tighten the band quicker and harder around the front clutch retainer drum. What we will tell you, however, is that the engine we built with the help of Indy Cylinder Head made enough power that it should propel our 2010 Dodge Challenger to sub-ten second elapsed times in the quarter mile.
This kit includes all the normal high-quality pieces needed to rebuild our 904, including the clutches, steels, bands, seals, gaskets, and even bushings. Many thanks to David Frey, Vicki Milley, Debbie Hoflo, and a very special thank you to Tom Mallot for his photographic help. He told me that he had been the owner of that Dodge Polara and had recently sold it; and, since I had repaired his transmission in 1969, he had not had any further issues. You must download and install Adobe Digital Editions software on each device you plan to read from. Note: Performance Automatic Chrysler transmissions do not include the driven gear for a cable driven speedometer or vehicle speed sensor. If you are interested in more detail than I have given, get the. Clearance is controlled by a selective thrust washer on the reaction shaft support, available in 3 thicknesses.
The reaction shaft has a bushing in it to support the input shaft which is part of the rear clutch assembly , oil pump assembly. The rear clutch driving discs that are splined to the front annulus gear are free to spin, and the annulus gear is stationary. And while some may argue that a 727 would be the logical choice for this application, we picked a 904 for its lighter total weight and lower internal friction. There are many types of kits made to improve Torqueflite and I'll give my recommendations on the ones I'm familiar with. The channels in both valve body and transfer plate that resemble endless mazes, transfer fluid from valve to valve, or valve to case passageway. However, if the transmission is removed, a few more key items can be changed to give bullet proof operation. For now, I'll just point out that the filter and filter extension are at the top, the valve body and associated valves, springs, balls, and end plates are on the left, the separator plate is in the right-center and the transfer plate is at the right.
A 904 Race TorqueFlite to back up a powerful late-model Hemi Of all the components that make up a Mopar performance vehicle, the automatic transmission is likely the least understood both by the general public, enthusiasts, and even some mechanics. You don't get as much driver control and the 2-3 shift is not as good as the Transgo kits provide but they are still a good value for the dollar. This is a good kit for motor homes, taxis, and police vehicles; good shifts, firm, yet comfortable B. When the clutch is spinning but not hydraulically operating, residual fluid can be forcing the piston out against the pressure plate front clutch or Belleville washer rear clutch , creating clutch drag. The Stator gives proper direction to the fluid flowing between the impeller and turbine. Organize your eBooks into a custom library and annotate pages. Great photos and detailed instructions make it much less intimidating to start ripping apart your transmission for a rebuild.