Transmission Mount

This procedure covers the removal and replacement of the transmission mount on a 2014-2018 Chevrolet Silverado 1500 with the 5.3L V8 EcoTec3 engine, including crossmember removal and reinstallation.

Warnings

Tools required

Parts

• Transmission mount assembly × 1 — Use OEM specification

Preparation

1. Park vehicle on level surface and engage parking brake
2. Chock the rear wheels to prevent movement
3. Raise vehicle using floor jack at factory lift points
4. Support vehicle securely with jack stands at frame locations
5. Allow exhaust system to cool completely if vehicle was recently driven
6. Position transmission jack or floor jack with wood block under transmission pan (avoid placing jack on drain plug)

Procedure

1. 1

   Support the transmission
   Raise the transmission jack or floor jack until it just makes contact with the transmission pan. Apply slight upward pressure to take the weight off the mount, but do not lift the transmission significantly. Use a block of wood between the jack and pan to distribute load and prevent pan damage.
2. 2

   Remove transmission mount-to-crossmember bolts
   Locate the two bolts securing the transmission mount to the crossmember. These are accessed from underneath the vehicle. Remove both bolts completely and retain hardware.
   Torque spec

   Transmission Mount Bolts65 Nm (48 lb-ft)
3. 3

   Remove crossmember-to-frame bolts
   Locate the crossmember bolts on both sides of the vehicle where the crossmember attaches to the frame rails. There are typically two bolts per side. Remove all four bolts and retain them. Note the orientation of any washers or spacers.
   Torque spec

   Crossmember Bolts95 Nm (70 lb-ft)
4. 4

   Lower and remove crossmember
   Carefully lower the crossmember away from the frame. You may need to slightly raise or lower the transmission jack to provide clearance. Remove the crossmember completely from under the vehicle.
5. 5

   Remove transmission mount-to-transmission bolts
   With the crossmember removed, access is now available to the bolts securing the mount to the transmission. Remove these bolts (typically 2-3 bolts depending on mount design). Support the mount as you remove the last bolt.
   Torque spec

   Transmission Mount Bolts65 Nm (48 lb-ft)
6. 6

   Remove old transmission mount
   Remove the transmission mount from the transmission. Inspect the mounting surface on the transmission for damage, cracks, or stripped threads. Clean the mounting surface with a wire brush if necessary.
7. 7

   Install new transmission mount
   Position the new transmission mount onto the transmission. Align all bolt holes properly. Install the mount-to-transmission bolts and hand-tighten them initially. Ensure the mount is properly seated before proceeding.
8. 8

   Torque mount-to-transmission bolts
   Using a torque wrench, tighten the transmission mount-to-transmission bolts to specification in a cross pattern if multiple bolts are present. Verify all bolts are properly seated and torqued.
   Torque spec

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

   Install crossmember
   Raise the crossmember into position, aligning the bolt holes with the frame rails on both sides. You may need to adjust the transmission jack height slightly to align the mount with the crossmember. Install all crossmember-to-frame bolts hand-tight initially.
10. 10

    Torque crossmember-to-frame bolts
    Using a torque wrench, tighten the crossmember-to-frame bolts to specification. Start with one side and work to the other to ensure even seating. Verify the crossmember is properly positioned against the frame before final torque.
    Torque spec

    Crossmember Bolts95 Nm (70 lb-ft)
11. 11

    Install mount-to-crossmember bolts
    Install the bolts connecting the transmission mount to the crossmember. Hand-tighten initially, ensuring proper thread engagement. The mount should align naturally with the crossmember holes when the transmission is properly positioned.
12. 12

    Torque mount-to-crossmember bolts and remove jack
    Torque the transmission mount-to-crossmember bolts to specification. Once all fasteners are properly torqued, slowly lower the transmission jack to transfer the weight fully to the new mount. Remove the transmission jack from under the vehicle.
    Torque spec

    Transmission Mount Bolts65 Nm (48 lb-ft)

Reassembly

1. Verify all bolts are torqued to specification and no tools or parts remain under vehicle
2. Remove jack stands and carefully lower vehicle to ground

Verification

• Start the engine and shift through all transmission gears while stationary to verify smooth operation
• Check for excessive vibration or abnormal movement of the transmission
• Perform a test drive and verify no unusual vibrations, especially during acceleration and deceleration
• Re-inspect all fasteners after test drive to ensure none have loosened
• Visually inspect the mount installation from underneath to verify proper seating and alignment

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