3.1108G Transmission Mount Kit fits GM RWD Cars and 2WD Trucks TH350 TH400 700R4

Transmission Mount Kit for GM RWD Cars and 2WD Trucks

This transmission mount kit, part number 3.1108G, provides a fresh mounting solution for GM rear-wheel drive cars and 2WD trucks running TH350, TH400, or 700R4 transmissions, helping secure the gearbox to the crossmember and damp driveline vibration.

Overview

This 3.1108G transmission mount kit is built to replace a worn or collapsed mount on GM rear-wheel drive cars and 2WD trucks. The mount supports the transmission, absorbs road and engine vibration, and helps keep driveline angles consistent. It is a practical service part for daily drivers, project builds, and work trucks running the TH350, TH400, or 700R4.

Built For Performance

• Direct-fit replacement for the original transmission mount position on listed GM applications
• Rubber-isolated body to reduce vibration and noise transfer into the cabin
• Steel base plate for stable load-bearing under the transmission tail housing
• Compatible with TH350, TH400, and 700R4 three and four-speed automatic transmissions
• Kit includes mounting hardware for a complete install
• Serviceable design that matches common crossmember bolt patterns

Fits These Machines

• for GM rear-wheel drive cars with TH350 transmission
• for GM rear-wheel drive cars with TH400 transmission
• for GM rear-wheel drive cars with 700R4 transmission
• for GM 2WD trucks with TH350 transmission
• for GM 2WD trucks with TH400 transmission
• for GM 2WD trucks with 700R4 transmission

On-The-Job Use

• Replacing a cracked or sagging mount during transmission service
• Repairing driveline clunk or vibration on higher-mileage trucks
• Freshening mounts during an engine or transmission swap
• Restoring correct driveline angle after a lift or suspension change

Specs At A Glance

Good To Know

Q: Does this kit fit both cars and trucks? A: Yes, it is listed for GM rear-wheel drive cars and 2WD trucks running TH350, TH400, or 700R4 transmissions. Confirm your crossmember and tail housing setup before ordering.

Q: Do I need to reuse the original bolts? A: The kit is designed as a complete mounting solution, so check the included hardware against what is already on your vehicle. Torque fasteners to factory spec during installation.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.