Racedodge, thanks for a terrific post. Chrysler torqueflite a904 a727 transmissions how to rebuild repair. Chrysler was the first to develop better racing automatics since they already had the most dependable automatic transmissions on the road. A reputable transmission man said this would make a difference and cause vibration. It is not immediately obvious why reverse should be so high until the rear clutch and front clutch are compared. Remember that this planet carrier is splined to the output shaft so it, too, turns at engine speed. Now that switch will operate the reverse lamps.
Do you just have A904 questions and need some answers? Tom hand's guide to the chrysler torqueflite automatic transmission wideratio torqueflite. . As in the other units, the 904 planetarys, output shaft, and governor assembly are similar to the 727 pieces, but smaller in size. Most 904s have a single width band, but some 998 and 999 versions of the 904 have a drum with five clutches, and need a wider band to hold it. Drag race transmission torqueflite 727 full manual chrysler big. Therefore, through a couple of hydraulic tricks, line pressure is almost tripled to give the front clutch the necessary holding power.
Drive Breakaway Drive breakaway or low gear is used to move the vehicle from a dead stop or very slow roll. The rear planet carrier is splined to the low-reverse drum which is held stationary by the over running clutch. The Torqueflite in Operation After reviewing all the previous information to get an idea what the various assemblies look like and do, the Torqueflite can now be studied as a complete unit. The case is in the upper left corner. A seal is used at the end of the housing to ride on the drive shaft yoke to keep oil contained in the case.
The first part explains the individual units of the Torqueflite automatic transmission. However, the shock of 4000 to 6000 rpm drops on the starting line created enormous loads on tires and driveline components. These transmissions were coded A-488s and were standard on 1957 Imperials and other Chrysler models. To overcome this reluctance and to learn at the same time, I got a spare valve body from a salvage transmission and followed the Chrysler service manual in disassembly and reassembly procedures. Patc 727 to 518 46rh conversion kit click here for 727 to 46rh 727 to 518 conversion instructions. Since it was from a truck with a standard 4 speed I am not sure. Two cast iron sealing rings, the governor body-park pawl assembly, and the governor valve-governor weight assembly all work together to send the governor signal to the valve body to tell it to operate various shift valves, controlling up and down shifts.
The front clutch is sealed to the reaction shaft by the two cast iron rings that direct oil from the pump to the inside of the front clutch. We really hope you can accept it as one of your reference and many thanks for your free time for browsing our blog. Obviously, these are not intended for Imperials or anything used for normal transportation. With our pieces coming together, the next step was to build our transmission. From top left you will see the Pan, the Case, and the Tail shaft, or Extension Housing and associated hardware. Again, these firm, properly timed shifts eliminate slippage of friction material during shifts.
Even these changes weren't enough in some cases. 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. Individual pieces cannot be interchanged between the standard and controlled-load servos. The Impeller and Turbine transfer fluid between each other to drive the Input Shaft of the transmission. This will fill the converter which gives a quicker vehicle response. This will explain just about everything you would want to know about 1966 and later Torqueflite 904s and 727s. Do I have a 727 or a 904? The thrust washers prevent wear between the rotating members.
The last row contains the Output Shaft, Governor Assembly and the Output Shaft Support Bearing. What are the differences between the shift levers, are there any? Chrysler a727 transmission hemmings daily by jim o'clair from the august 2007 issue of hemmings motor news. If you check the level in park, the level checks higher than it really is. The wrong kits will cause too severe 1-2 and 2-3 shifts, harsh park or neutral-to-reverse shifts, and some light throttle 2-3 overlap. The representative asked me what I thought had caused the failure. Engine torque can now be transferred through the transmission. Often I or anyone for that matter asks to find out what type of transmission they have in their old mopar.
Transmission problem I am having a transmission issue that i hope someone can help me with. 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. The is the place where the industries best transmission rebuilders work together to help solve the most complex automatic transmission problems. This is good for full-race vehicles or ones where the driver likes to do a lot of shifting. When it comes to a racing transmission, we would consider this 904 to contain the minimum modifications necessary to handle a moderately powered, somewhat heavy drag car. Below it are the cooler line fittings, the shifter shaft seal, and neutral start switch. The best remedy for this is to start the vehicle in park and then immediately shift to neutral.
I had no idea that they would consider upgrading to a wider front clutch retainer bushing, so the end play was my primary suggestion. The same oil is also present at the governor and the signal is modulated and returned to the valve body to prepare for the 1-2 shift. The photographs included with this article are of a 1976 727-A that I built for a police car I spent a lot of time cleaning this unit and at the same time, learning that washing parts in a dishwasher works but tends to rust them. Torqueflite Case Assembly Shown is a 727 case and associated pieces the 904 is almost identical except the size and shape of everything is slightly reduced. A reputable transmission man said this would make a difference and cause vibration.
But going into reverse, the vehicle is stationary, and much greater torque 2. The 904 uses different kickdown bands to hold the front clutch retainer drum during second gear. Tom hand's guide to the chrysler torqueflite automatic transmission reverse automatic. This is due to the converter not being fully charged in park. Torqueflite Exploded View Before going into details of each subassembly in the Torqueflite, refer to the exploded view of a complete 1976-727 transmission. Automatics have usually been four to six percent less efficient than manual transmissions.