Transmission Input Shaft Bearing

Replace the transmission input shaft bearing on a 2008 Dodge Viper with 8.4L V10 and Tremec T56 6-speed manual transmission, requiring transmission removal and partial disassembly.

Warnings

Tools required

Parts

• Transmission input shaft bearing × 1 — Use OEM specification or Timken/SKF equivalent
• Transmission input shaft seal × 1 — Replace during reassembly
• Bellhousing gasket × 1 — Use OEM specification
• Clutch release bearing × 1 — Inspect and replace if worn
• Transmission case gasket or RTV sealant × 1 — Use Mopar or equivalent
• Transmission mount × 1 — Inspect and replace if deteriorated

Fluids

• Pennzoil Synchromesh 75W-90 — 4.2 qt

Preparation

1. Park vehicle on level surface and engage parking brake
2. Disconnect negative battery cable
3. Allow exhaust system to cool completely if vehicle was recently operated
4. Raise vehicle and secure on jack stands at all four corners to provide adequate working clearance
5. Remove rear wheels if additional clearance is needed
6. Place drain pan under transmission drain plug location
7. Mark driveshaft and differential flange orientation for proper reinstallation alignment

Procedure

1. 1

   Drain transmission fluid
   Locate the transmission drain plug on the bottom of the case. Remove the drain plug and allow all fluid to drain into a suitable container. Reinstall drain plug finger-tight to prevent contamination during transmission removal.
2. 2

   Remove driveshaft
   Remove the 4 bolts securing the rear driveshaft universal joint to the differential companion flange. Support the driveshaft and disconnect it at the transmission output flange and center bearing support as applicable. Remove the driveshaft from under the vehicle. Verify the correct driveshaft configuration for this two-piece Viper application before proceeding.
3. 3

   Disconnect shifter and electrical connections
   Remove the shifter handle/assembly from inside the vehicle by removing the shifter boot and the shifter-to-tower bolts. Disconnect the reverse light switch electrical connector and any speed sensor connectors from the transmission case. Disconnect the reverse light switch electrical connector and any speed sensor connectors from the transmission case. Secure wiring harnesses away from transmission removal path.
4. 4

   Disconnect clutch hydraulic line
   Locate the clutch slave cylinder hydraulic line connection at the bellhousing. Disconnect the hydraulic line from the slave cylinder or bellhousing fitting. Cap or plug the line to prevent fluid loss and contamination. The slave cylinder may remain attached to the bellhousing for transmission removal on this platform.
5. 5

   Support engine and remove crossmember
   Install an engine support fixture across the engine compartment to support the engine weight, or use an overhead hoist with load leveler if available. Position a transmission jack under the transmission and secure it with the adapter or safety chain. Remove the fasteners securing the transmission mount to the crossmember. Remove the crossmember mounting bolts and lower the crossmember from the vehicle.
6. 6

   Remove starter motor
   Disconnect the electrical connections from the starter motor solenoid. Remove the starter motor mounting bolts and withdraw the starter from the bellhousing. Remove the starter motor as needed for access. Verify whether starter removal is required to reach upper bellhousing bolts on this specific platform.
7. 7

   Remove bellhousing-to-engine fasteners
   Remove all bellhousing-to-engine block bolts. Remove all bellhousing-to-engine block bolts (verify exact count for this platform against service documentation). Work around the perimeter of the bellhousing, removing upper and lower bolts. Note bolt length and location if they vary.
8. 8

   Remove transmission from vehicle
   Ensure transmission is securely attached to transmission jack. Carefully slide the transmission rearward, keeping it level to disengage the input shaft from the clutch disc and pilot bearing. Continue sliding until the input shaft clears the bellhousing. Lower the transmission on the jack and roll it out from under the vehicle. Move to a clean workbench for disassembly.
9. 9

   Remove bellhousing from transmission case
   With transmission on workbench, remove the bolts securing the bellhousing to the main transmission case. Remove the bolts securing the bellhousing to the main case (verify exact count against service documentation). Carefully separate the bellhousing from the main case, tapping gently with a soft mallet if needed to break the gasket seal. Remove and discard the old gasket.
10. 10

    Remove input shaft assembly
    With the bellhousing removed, you will have access to the input shaft front bearing. Remove the snap ring securing the input shaft bearing in the front of the main case using internal snap ring pliers. The input shaft assembly may need to be withdrawn from the front of the case or the case may need to be split further depending on bearing failure mode. If the bearing inner race is seized on the shaft, note the disassembly sequence for accessing the shaft from inside the case. Consult the T56 service manual for the correct disassembly sequence to access the input shaft bearing, which may require removal of the front bearing retainer and internal gear train disassembly.
11. 11

    Remove failed input shaft bearing
    Once the input shaft is accessible, remove the failed bearing from the shaft. If the bearing inner race is still on the shaft, use a bearing puller to extract it. If the bearing outer race remains in the case bore, use a bearing race puller or drift to drive it out from the opposite side. Inspect the input shaft bearing journal for scoring, wear, or damage. If the shaft journal is damaged beyond light polishing, the input shaft must be replaced. Clean all bearing surfaces thoroughly with solvent.
12. 12

    Install new input shaft bearing
    Inspect the new bearing for proper fit on the input shaft journal. The bearing should be a light press fit. If installing with the shaft removed from the case, support the shaft appropriately and press the new bearing onto the shaft using a bearing driver or press plates that contact only the inner race. Drive or press the bearing until it seats against the shaft shoulder. If installing the bearing in the case bore first, press the bearing into the case bore using a driver that contacts only the outer race, ensuring it is square and fully seated. Install the bearing retaining snap ring, ensuring it is fully seated in its groove.
13. 13

    Reassemble transmission
    Reinstall the input shaft assembly into the main case, reversing the disassembly sequence. Ensure all internal components are properly aligned and engaged. Install a new bellhousing gasket on the main case. Install the bellhousing onto the main case and install all bellhousing-to-case bolts, tightening in a cross pattern. Reinstall the shift tower components if they were removed. Verify that the input shaft rotates freely without binding and that all gears engage properly through the shift mechanism.
14. 14

    Inspect clutch assembly
    With the transmission removed, inspect the clutch disc, pressure plate, flywheel, and release bearing. Check the clutch disc for wear, oil contamination, or damage. Inspect the pressure plate fingers for wear and the friction surface for hot spots or cracks. Check flywheel surface for glazing, hot spots, or step wear. Measure flywheel runout with a dial indicator if available; maximum runout specification is typically 0.005 inch. Replace clutch components as needed. If the release bearing shows wear or noise, replace it now while the transmission is out. Note: Clutch dust may contain harmful particulates. Use appropriate respiratory protection and avoid creating dust.
15. 15

    Install transmission
    Apply a thin film of high-temperature grease to the input shaft splines and pilot bearing. Ensure clutch disc is installed in the correct orientation per the markings on the disc (typically the raised hub faces the transmission/pressure plate side). Use a clutch alignment tool to center the clutch disc in the flywheel. Position the transmission on the transmission jack and raise it into position. Carefully align the input shaft with the clutch disc splines and pilot bearing, rotating the output shaft if necessary to align splines. Slide the transmission forward until the bellhousing seats against the engine block. Install all bellhousing-to-engine bolts and tighten in a cross pattern to the manufacturer-specified torque (verify value against service documentation). Install the starter motor and electrical connections. Install the transmission crossmember and mount, then remove the engine support fixture. Reconnect the clutch hydraulic line, shifter linkage, and electrical connectors. Install the driveshaft, aligning the marks made during removal, and install the flange bolts and center support fasteners, torquing to specification (verify count and torque against service documentation).
16. 16

    Refill transmission and bleed clutch
    Remove the transmission fill plug on the side of the case. Using a fluid pump, fill the transmission with the manufacturer-specified fluid type and quantity until fluid begins to run out of the fill hole (verify fluid specification and capacity against Viper service documentation). Install the fill plug. If the clutch hydraulic line was disconnected, bleed the clutch system by pumping the clutch pedal and opening the bleeder valve on the slave cylinder until all air is purged and firm pedal feel is restored. Top off the clutch master cylinder reservoir with the manufacturer-specified brake fluid grade as needed (verify DOT 3 vs DOT 4 against service documentation).

Reassembly

1. Torque all fasteners to specification when documented values become available
2. Ensure driveshaft is installed with alignment marks matched to prevent vibration
3. Verify clutch pedal has proper free play and engagement point after bleeding
4. Check transmission fluid level after test drive and top off if necessary

Verification

• Lower vehicle and reconnect battery
• Start engine and verify no unusual noises from transmission with clutch engaged
• With engine running and clutch pedal depressed, shift through all gears to verify proper engagement
• Perform a test drive, checking for smooth shifting, proper clutch engagement, and no bearing noise in all gears
• Check for fluid leaks around bellhousing, drain plug, and fill plug after test drive
• Verify transmission shifts smoothly under load and that there is no grinding or gear clash

Related trouble codes on this vehicle

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