The Torqueflite is relatively straight forward. 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. 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. The rear pump was eliminated, which simplified and cost-reduced the transmission but rendered push-starting impossible; Chrysler engineers reasoned that improved electrical and fuel systems reduced the need to push-start vehicles, and safety concerns weighed against doing so. Being very into transmissions at the time I asked him a lot of questions. All those moving parts cause more heat.
Your hub for horsepower Get first access to hit shows like Roadkill and Dirt Every Day Join free for 14 days now Finding a 727 or 904 in a scrap yard is relatively easy. Modifications made since 1966 have been small and related to longevity and driver comfort. . The case is in the upper left corner. When the Torqueflite shifts from 1st to 2nd, the kickdown band locks around the Front Clutch Retainer to stop the sun gear driving shell.
But there are laws outlining that properly formulated fluids by other brands can be used without jeopordizing the warranty. We now have a detailed section on and the. Drive Breakaway Drive breakaway or low gear is used to move the vehicle from a dead stop or very slow roll. Then the front clutch is applied, which locks on to the front clutch hub-input shaft assembly. Tom Hand shares his decades of experience rebuilding TorqueFlite transmissions with chapters dedicated to troubleshooting, disassembly and reassembly, performance modifications, post-installation procedures, and the most thorough source guide offered in print, ever.
When the gear selector is placed in manual low 1 , the rear band and clutch are applied. During coast or deceleration, the weight of the vehicle and its momentum drive the planetary units through the output shaft. What I really enjoyed about this book is that it explains more than just assembly, but reassembly and even disassembly. It is not immediately obvious why reverse should be so high until the rear clutch and front clutch are compared. In drive breakaway, the rear clutch is applied and line pressure is directed to various valves in the valve body. With the sun gear held and the annulus rotating, the planet carrier is spinning at a reduced speed. But bottom line is that there has to be a wider variety of transmission formulations for specific applications if one is to expect the proper performance.
Also the recommended service intervals have gotten longer so the synthetic fluids make it easier to go longer periods without changes. The two multiple-disc clutches are called the front and rear clutch packs. All Torqueflites had the same internal ratios, until, starting in 1980, a wide-ratio gearset was created for most of the 998 and 999 transmissions 2. With the band released, the front clutch starts spinning. Sealed in an iron case, this first TorqueFlite had both a front and rear pump, the latter allowing push-starts. The 904 rear clutch is smaller but similar to the 727; and the front clutch hub-rear clutch retainer is in two separate pieces in the 727 but only one in the 904.
Governor pressure is also directed to the 2-3 valve in preparation for that shift. The band holds the carrier during deceleration when the one-way clutch freewheels, this does allow foe engine braking during coasting. The pan and filter were updated during the 1998 model year with some Dodge applications which has a deeper oil pan and a redesigned oil filter which is held with 2 valvebody screws the single oil port filter does interchange with the older A500 and A904 derivatives along with the oil pan. No Dexron of any type or variety, even with additives. The first Torqueflites provided three speeds forward plus reverse. There is little doubt that some of these automatics could be prone to failure, or at least need a thorough rebuild. The other type of servo assembly does not use an internal spring-piston assembly, and is usually found in high performance applications where soft shifts would be detrimental.
You must download and install Adobe Digital Editions software on each device you plan to read from. Forward direct clutch drum same as the A998 usually has a 4 friction disc pack - an A999 forward direct clutch drum with the 5 friction disc pack does interchange. This case is 727-A which fits all small blocks. 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. The planetaries and sun gear in the top row give gear reductions and reversals; the output shaft transfers output torque; and the governor controls the shift points. Previously, an automatic 3-2 downshift occurred only if the driver pushed the accelerator to the floor.
Chrysler Torqueflite Transmissions Chrysler Corporation introduced the Torqueflite transmission in 1956. This will fill the converter which gives a quicker vehicle response. This is due to the converter not being fully charged in park. Automatics have usually been four to six percent less efficient than manual transmissions. A factory representative was to observe the disassembly. Reasons for Modifications Stock Torqueflites, since the very beginning, have been very reliable. But at some point that powerful big-block, small block, or Hemi in your Mopar will overpower a stock TorqueFlite transmission, requiring the transmission to be upgraded to handle additional power and torque.
The four-speed electronic four-speed automatic transaxle would eventually replace it, but the three-speed lasted for more than a decade after the 1989 debut of the four-speed unit. This causes the ring gear to drive the front planet gears in a clockwise direction. The converter consists of three elements, all necessary for proper transmittal of motion. Good overhaul gasket and seal kits are available from many different sources so check around. Some higher performance 904 units were designated as 998s and 999s in the later 1970s.
The next row has the Oil Pump and the Front Clutch assembly shown. The planet gears cause the rear ring gear and the output shaft to turn in clockwise direction. Depending on gear selection, the sun gear-driving shell assembly will be driven by the front or rear clutch packs and will transmit torque to the rear planetary assembly. This is still 2-3 shift overlap at slow speeds and minor adjustment usually eliminates this. Advantages to Torqueflite modification Advantage number one to Torqueflite modification is elimination of the 2-3 shift overlap which gives a crisp, efficient shift from second to third, prolonging the friction material life.