Repair 7

How to Change a Transmission Mount on a 1987 Chevrolet Suburban

A Suburban transmission mount is a block of rubber, bonded between a metal plate on top and a threaded stud centered on the bottom. The mount fits between the transmission tail-shaft and the cross member. It bolts to the two threaded holes under the transmission tail shaft, and to the bracket on the cross member, with a threaded stud. The transmission mount failure occurs when the rubber gets stretched or becomes separated from the top plate or the threaded stud on the bottom. Even when new, some transmission mounts allow for movement and noise.

Instructions

Remove the Transmission Mount

1

Drive the Suburban onto a set of ramps, and apply the emergency brake.

2

Place blocks on the front and rear side of the rear wheels, to prevent the truck from rolling.

3

Go under the vehicle, using a creeper. Place the tools and hydraulic bottle jack within reach.

4

Remove the two mount bolts on the bottom of the transmission tail shaft, as well as the nut from the threaded stud in the cross member. It may be necessary to hold the rubber mount with a pair of lockjaw pliers, while removing the nut from the cross member.

5

Place a bottle jack under the tail of the transmission, and jack it high enough to remove the old transmission mount.

6

Insert the new transmission mount with the threaded stud through the hole in the cross member bracket.

7

Thread the two top bolts into the tail shaft of the transmission, and tighten.

8

Lower the transmission, centered onto the cross member, with the threaded stud through the cross member bracket, and tighten.

9

Remove the blocks from the rear wheels, and back the vehicle off the ramps.