66RFE Automatic Transmission - Service Information: Specifications RAM Cab & Chassis 3500 HD

SPECIFICATIONS

GENERAL

66RFE FLUID

GEAR RATIOS

TORQUE SPECIFICATIONS

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1. Disconnect the negative battery cable.
2. Raise and support the vehicle
3. Remove any necessary skid plates. Refer to «PLATE, SKID, FRONT, REMOVAL»(ref-476503-S01914809092012060400000) or «PLATE, SKID, TRANSFER CASE, REMOVAL»(ref-476503-S37395847282012060400000) .
4. Mark propeller shaft and axle companion flanges for assembly alignment.
5. Remove the rear propeller shaft
6. Remove the front propeller shaft, if necessary.
7. Remove the engine (1) to transmission (3) structural dust cover (2).
8. Remove the exhaust support bracket from the rear of the transmission.
9. Disconnect and lower or remove any necessary exhaust components.
10. Remove the starter motor.
11. Rotate crankshaft in clockwise direction until converter bolts are accessible. Then remove bolts one at a time. Rotate crankshaft with socket wrench on dampener bolt.
12. Disengage the output speed sensor connector from the output speed sensor (2).
13. Disengage the input speed sensor connector from the input speed sensor (2).
14. Disengage the transmission solenoid/TRS assembly connector from the transmission solenoid/TRS assembly (2).
15. Disengage the line pressure sensor connector from the line pressure sensor (2).
16. Disconnect gearshift cable (1) from transmission manual valve lever by fully depressing pin (2) until it locks into the release position. Remove cable end by moving upward.
17. Disconnect the transmission vent hose from the transmission.
18. Support rear of engine with safety stand or jack.
19. Raise transmission slightly with service jack to relieve load on crossmember and supports.
20. Remove bolts securing rear support and cushion to transmission and crossmember.
21. If equipped, remove transfer case.
22. Disconnect transmission fluid cooler lines at transmission fittings and clips and position aside. NOTE: When disconnecting the transmission oil cooler lines, it is necessary to replace the line clip that is located on the oil pan stud. The retention force of the clip is severely degraded upon removal.
23. Remove all remaining converter housing bolts.
24. Remove the transmission dipstick tube.
25. Carefully work transmission and torque converter assembly rearward off engine block dowels.
26. Hold torque converter in place during transmission removal.
27. Lower transmission (2) and remove assembly from under the vehicle.
28. To remove torque converter, carefully slide torque converter out of the transmission.

TORQUE CONVERTER LIMIT VALVE

The torque converter limit valve serves to limit the maximum pressure supplied to the front side of the torque converter clutch.

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1. Remove the bolts holding the reaction shaft support (4) to the oil pump.
2. Remove the reaction shaft support (4) from the oil pump.
3. Remove all bolts holding the oil pump halves together.
4. Using suitable prying tools, separate the oil pump sections by inserting the tools in the supplied areas and prying the halves apart. NOTE: The oil pump halves are aligned to each other through the use of two dowels. Be sure to pry upward evenly to prevent damage to the oil pump components. 1 - SEPARATOR PLATE 5 - DOWEL (2) 2 - DRIVEN GEAR (2) 6 - DRIVE GEAR 3 - FLAPPER VALVE 7 - SCREW 4 - PUMP HOUSING
5. Remove the screws (7) holding the separator plate (1) onto the oil pump housing (4).
6. Remove the separator plate (1) from the oil pump housing (4).
7. Mark all gears for location. The gears are select fit and if the oil pump is to be reused, the gears must be returned to their original locations.
8. Remove the oil pump flapper valve (3) from its pocket in the pump housing.
9. Remove the oil pump gears (2, 6) from the oil pump housing (4). 1 - RETAINER 2 - T/C SWITCH VALVE 3 - OIL PUMP VALVE BODY
10. Remove the oil pump valve retainers (1) and TCC Switch Valve (2) and spring one at a time. Mark the combination of components as a group and tag them as to the location from which they were removed. 1 - T/C REGULATOR VALVE 2 - T/C LIMIT VALVE 3 - MAIN REGULATOR VALVE 4 - OIL PUMP VALVE BODY
11. Remove the T/C regulator valve (1), T/C limit valve (2), and main regulator valve (3).

TORQUE CONVERTER CLUTCH (TCC)

In a standard torque converter, the impeller and turbine are rotating at about the same speed and the stator is freewheeling, providing no torque multiplication. By applying the turbine's piston and friction material to the front cover, a total converter engagement can be obtained. The result of this engagement is a direct 1:1 mechanical link between the engine and the transmission.

The clutch can be engaged in all gear ranges except first depending on the Tow/Haul and ERS status. In normal operation, the clutch will engage after the shift to fourth gear. If the Tow/Haul mode is enabled, the clutch will engage after the shift to third (direct) gear.

The TCM controls the torque converter clutch via the L/R-CC Solenoid. There are four TCC operational modes

1. No EMCC
2. Partial EMCC
3. Full EMCC
4. Gradual EMCC Release