Transmission Mount

This procedure replaces the transmission mount on a 1994-2007 Dodge Ram 2500 with 5.9L Cummins diesel and 4WD, requiring support of the transmission while removing and installing the mount and crossmember.

Warnings

Tools required

Parts

• Transmission mount × 1 — Use OEM or equivalent rubber mount assembly

Preparation

1. Park vehicle on level ground and engage parking brake
2. Chock rear wheels securely
3. Allow engine and exhaust to cool completely if recently driven
4. Raise front of vehicle and support on jack stands at frame rails
5. Spray crossmember and mount bolts with penetrating oil if corrosion is present

Procedure

1. 1

   Position transmission jack
   Place transmission jack or floor jack under the transmission oil pan with a wood block to distribute load. Raise jack until it just contacts the pan with slight upward pressure, but do not lift the transmission yet. The jack should be positioned securely to support the transmission weight when the mount is removed.
   ⚠Use a wood block between jack and oil pan to prevent pan damage. Do not place jack on drain plug.
2. 2

   Remove crossmember-to-frame bolts
   Locate the transmission crossmember which runs laterally under the transmission. Remove the bolts securing the crossmember to the frame rails on both sides. Note the number and location of fasteners as configurations vary. Support the crossmember as you remove the final bolt.
3. 3

   Support transmission weight
   Carefully raise the transmission jack to lift the transmission slightly (approximately 1/4 inch) to unload the transmission mount. This removes pressure from the mount and allows removal of the mount-to-crossmember hardware.
   ⚠Lift only enough to unload the mount. Excessive lifting may strain transmission linkage, wiring, or driveshaft.
4. 4

   Remove transmission mount-to-crossmember bolts
   Remove the bolts or nuts securing the transmission mount to the crossmember. The mount typically attaches with two to four fasteners depending on design. Note orientation of any washers or spacers for reassembly.
5. 5

   Remove crossmember
   Lower the transmission jack slightly if needed to provide clearance, then remove the crossmember from under the vehicle. The crossmember may need to be maneuvered around the exhaust or transfer case skid plate.
6. 6

   Remove transmission mount-to-transmission bolts
   Remove the bolts or nuts securing the transmission mount to the transmission tailhousing/adapter bracket. Depending on transmission (47RE/48RE automatic or NV4500/G56 manual), the mount may attach to a bracket or thread into the tailhousing. Support the mount as you remove the final fastener.
7. 7

   Remove old transmission mount
   Remove the old transmission mount from the vehicle. Inspect the mounting surfaces on both the transmission housing and crossmember for damage, cracks, or excessive wear. Clean mounting surfaces with a wire brush if corrosion is present.
8. 8

   Install new transmission mount
   Position the new transmission mount to the transmission housing, ensuring proper orientation. The rubber isolator should be positioned correctly with any indexing features aligned. Install and hand-tighten the mount-to-transmission bolts.
   Torque spec

   Transmission Mount Bolts65 Nm (48 lb-ft)
9. 9

   Install crossmember
   Position the crossmember under the vehicle and align with the frame rail mounting holes. You may need to adjust transmission jack height slightly to align the crossmember properly. Install crossmember-to-frame bolts and hand-tighten.
10. 10

    Install mount-to-crossmember hardware
    Align the transmission mount with the crossmember mounting holes. Install the mount-to-crossmember bolts or nuts with any washers or spacers in their original positions. Hand-tighten all fasteners.
11. 11

    Lower transmission onto mount
    Carefully lower the transmission jack to allow the full transmission weight to settle onto the new mount. Ensure the mount is properly seated and centered before removing all jack pressure.
12. 12

    Torque all fasteners
    Torque the transmission mount-to-transmission bolts to specification. Then torque the crossmember-to-frame bolts to specification on both sides. Finally, torque the mount-to-crossmember fasteners to specification. Follow proper sequence: transmission first, then crossmember, then mount-to-crossmember.
    Torque spec

    Transmission Mount Bolts65 Nm (48 lb-ft)

    Crossmember Bolt95 Nm (70 lb-ft)
13. 13

    Remove transmission support
    Carefully lower and remove the transmission jack or floor jack from under the transmission. Verify the mount is supporting the full transmission weight without sagging or misalignment.

Reassembly

1. Verify all bolts are torqued to specification and no hardware was left loose
2. Ensure no tools or parts were left under the vehicle
3. Lower vehicle from jack stands

Verification

• Start engine and verify no abnormal vibration through cab or shifter
• Check transmission mount visually for proper alignment and no contact with crossmember under load
• Test drive vehicle and verify smooth operation through all gears with no excessive driveline vibration
• Inspect mount after test drive for any signs of movement or loosening of hardware

Related trouble codes on this vehicle

Codes that commonly send this job to the bay — tap one for symptoms, causes, and diagnostic steps.

Chasing one of these codes and not sure which part is guilty? Ask a master mechanic about YOUR car →

More procedures for this vehicle