Transmission Mount

Replace the transmission mount on a 1992 Dodge Viper RT/10 with 8.0L V10 and manual transmission, requiring transmission support and crossmember removal.

Warnings

Tools required

Parts

• Transmission mount × 1 — OEM Mopar or equivalent (verify for 1992 Viper RT/10)

Preparation

1. Park vehicle on level surface and apply parking brake firmly
2. Place wheel chocks behind rear wheels
3. Allow engine and exhaust system to cool completely if recently driven
4. Raise front of vehicle and support securely on jack stands at manufacturer-approved lift points
5. Visually inspect transmission mount area for existing damage, fluid leaks, or corrosion

Procedure

1. 1

   Position transmission jack
   Position the transmission jack under the transmission oil pan. Place a wood block between the jack and pan to distribute load and prevent damage to the pan. Raise the jack until it just contacts the transmission with minimal upward pressure—the transmission should still be resting on its mount.
2. 2

   Remove crossmember-to-frame bolts
   Locate the transmission crossmember bolts securing the crossmember to the tubular chassis mounting points on both sides. Verify the exact count and location for the 1992 Viper RT/10 against factory documentation. Apply penetrating oil if fasteners show corrosion. Remove all crossmember-to-chassis bolts and set aside.
3. 3

   Remove transmission mount-to-crossmember fasteners
   Locate the transmission mount-to-crossmember fasteners. Remove the nuts or bolts securing the transmission mount to the crossmember from below, verifying the exact count and type against factory documentation. Note the orientation of any washers or spacers.
4. 4

   Lower crossmember
   With all crossmember fasteners removed, carefully lower the crossmember away from the transmission mount. The crossmember should drop down several inches. If it binds, verify all fasteners have been removed. Set the crossmember aside in a safe location.
5. 5

   Support transmission weight
   Slowly raise the transmission jack to lift the transmission slightly and take the load off the mount. Raise only enough to unload the mount—approximately 1/4 to 1/2 inch of movement. Verify the transmission is stable and securely supported.
6. 6

   Remove transmission mount-to-transmission bolts
   Locate the bolts securing the transmission mount bracket to the transmission tailhousing. Verify the exact bolt count against factory documentation for the 1992 Viper's T-56 six-speed manual transmission. Remove all mount-to-transmission bolts and carefully extract the transmission mount assembly. Inspect the mount for cracking, separation of rubber from metal, or fluid saturation.
7. 7

   Clean mounting surfaces
   Use a wire brush to clean the transmission mounting surface and crossmember mounting surfaces. Remove all rust, debris, and old thread-locking compound from bolt holes. Inspect the transmission mount bracket on the tailhousing for cracks or damage.
8. 8

   Install new transmission mount
   Position the new transmission mount onto the transmission tailhousing, aligning bolt holes. Install the mount-to-transmission bolts finger-tight. Verify the mount orientation matches the original—the mount has a specific front-to-rear orientation. Torque the mount-to-transmission bolts to specification.
9. 9

   Lower transmission onto mount
   Slowly lower the transmission jack, allowing the transmission to settle onto the new mount. Lower until the mount is fully compressed and seated. Verify the mount is not twisted or misaligned.
10. 10

    Reinstall crossmember
    Raise the crossmember into position, aligning the mount studs or bolt holes with the crossmember. Install the mount-to-crossmember fasteners finger-tight. Align the crossmember ends with the frame rail mounting points on both sides.
11. 11

    Install crossmember-to-frame bolts
    Install all 4 crossmember-to-frame bolts finger-tight. Verify the crossmember is properly seated against the frame rails on both sides with no gaps. Torque the crossmember-to-frame bolts to specification in a criss-cross pattern (front left, rear right, front right, rear left).
12. 12

    Torque mount-to-crossmember fasteners
    Torque the transmission mount-to-crossmember nuts or bolts to specification. Ensure any washers or spacers are properly positioned.
13. 13

    Remove transmission jack and lower vehicle
    Carefully lower and remove the transmission jack from under the vehicle. Inspect all fasteners visually to confirm proper installation. Lower the vehicle from jack stands and remove wheel chocks.

Reassembly

1. Torque all fasteners to specification using a calibrated torque wrench
2. Double-check that all crossmember and mount bolts are installed and properly torqued
3. Ensure transmission jack is fully clear before lowering vehicle

Verification

• Start engine and verify no unusual vibration at idle in neutral
• With parking brake applied, cycle through all gears and verify smooth shifting without binding
• Visually inspect mount and crossmember from underneath while engine is running—there should be minimal transmission movement
• Test drive vehicle and verify no excessive vibration or clunking during acceleration, deceleration, or gear changes
• After test drive, re-inspect all mount and crossmember fasteners for proper torque and no loosening

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