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Replacing the Transmission Mount in Long Nose 96.
The car: 1967 Monte Carlo 850.
The problem: A lot of vibration when the car is idling or driving at low RPM. The vibration went away entirely above 4,000 RPM.
The cause: Worn rear transmission mount.
The correct fix is; of course, remove the engine and transmission and replace the rear transmission mount. That is a lot of work, so I did a temporary fix that might last 20 years.
Saab sport and Rally had an accessory item, a rubber pad that bolted to the engine compartment floor, under the rear of the transmission. The transmission sat on the pad, taking some stress off the rear transmission mount. I decided to install a similar rubber pad to see if that would eliminate the vibration problem. I used a rubber floor jack pad; I figured they are very hard and should be up to the task. A socket was placed on my floor jack. The socket went over the transmission drain plug, allowing me to jack up the transmission, without damaging the plug. Once the transmission was jacked up, I slid the pad under the transmission (see photo), then lowered the jack.
The car is transformed! All of the vibration went away; I cannot begin to tell you what a difference it made. The car is finally quiet and a pleasure to drive.
I promise to install a new rear transmission mount the next time I have the engine out.
Bruce Turk, 2024
The problem: A lot of vibration when the car is idling or driving at low RPM. The vibration went away entirely above 4,000 RPM.
The cause: Worn rear transmission mount.
The correct fix is; of course, remove the engine and transmission and replace the rear transmission mount. That is a lot of work, so I did a temporary fix that might last 20 years.
Saab sport and Rally had an accessory item, a rubber pad that bolted to the engine compartment floor, under the rear of the transmission. The transmission sat on the pad, taking some stress off the rear transmission mount. I decided to install a similar rubber pad to see if that would eliminate the vibration problem. I used a rubber floor jack pad; I figured they are very hard and should be up to the task. A socket was placed on my floor jack. The socket went over the transmission drain plug, allowing me to jack up the transmission, without damaging the plug. Once the transmission was jacked up, I slid the pad under the transmission (see photo), then lowered the jack.
The car is transformed! All of the vibration went away; I cannot begin to tell you what a difference it made. The car is finally quiet and a pleasure to drive.
I promise to install a new rear transmission mount the next time I have the engine out.
Bruce Turk, 2024
