What is a Transmission Mount?

Transmission Mount Basics

Your transmission’s primary purpose is to keep the engine and wheels of your vehicle turning in sync. The transmission mount plays a significant role in keeping vibrations to a minimum.

A transmission mount holds the rear of the transmission, or tailshaft, securely to a crossmember. The crossmember is a support that is welded or bolted to the chassis. Typically, a transmission mount has a rubber or urethane bushing, which is bolted or welded to a bracket. The entire assembly securely fastens the transmission to the vehicle crossmember.

Once in place, the transmission mount also helps isolate and curb vibrations from the driveline by ensuring the linkages and driveshaft angles are correct. The number of transmission mounts needed depends on the vehicle. Most require one, but two or more are possible.

How do you know if you should replace your transmission mount?

When performing an engine swap, you might need a new transmission mount to secure the replacement transmission in place. Additionally, a transmission mount can go bad. The signs of a worn transmission mount include:

  1. Loud sounds from the engine

    If you hear noises like your engine is breaking when you put your car in gear or shut it down, that’s a good indication that your transmission mount may be failing. The clunking and banging are the sounds of metal knocking into metal as the engine shifts and moves.

  2. Thumping sounds

    This sound usually happens when you go over a bump in the road. It’s an indication that the transmission is shifting up and down while you’re driving.

  3. Unusual vibrations

    Shaking so intense it’s uncomfortable for passengers is another sign a it has gone bad.

  4. Trouble turning

    Because the loose transmission shifts as the car moves, the weight imbalance makes it more difficult to pull out of a turn. It is particularly noticeable when the car is accelerating.

  5. Door misalignment

    Typically, loud sounds, thumping, and unusual vibrations occur long before you notice chassis flex. Over time excessive vibrations and shifts in weight from the loose transmission cause the frame to become warped.

If you are so inclined, you can check for a faulty transmission mount by inching beneath your car and moving the transmission tailshaft in all directions—up and down as well as back and forth. More than an inch of give in any direction is a good indication that the mount is bad. Experts recommend that if there is more than one installed, you should replace all of them simultaneously.

GF-GMATM Adjustable Transmission Mount- GM RWD with mounting hardwareTransmission Mount Replacement

Usually, designed to fit the make, model, and year of your car as well as the transmission you are installing, a replacement is available from the automotive aftermarket. It is necessary to confirm the dimensions of the current one before purchasing a replacement.

Recently, G Force introduced an adjustable transmission mount. Because it is adjustable, it allows for an offset of 1 inch to 2.5 inches and is perfect for LS swaps that require moving the transmission from stock positions. It also prevents the misalignment of the transmission and drivetrain. Plus, the bolt-in design simplifies installation.

The polyurethane bushing reduces vibrations, while the strong mounting hardware improves stability. The ability to adjust the placement before securing the slide bolt allows you to align your driveshaft and transmission quickly and easily. Accurate positioning of the assembly is a snap. Therefore, the adjustable mount fits most manual or automatic GM RWD transmissions and has an installed height of 1.75 inches.

What about the Crossmember?

Because the transmission mount is secured to the crossmember, it stands to reason the strength and durability of it also is important. G Force is an industry leader in crossmembers.

Since they are crucial to body panel alignment, transmission mount stability, and proper vehicle handling, we engineer our crossmembers to hold up under the toughest loads. Independently tested and road-proven, the double-hump design allows ample space for factory and aftermarket exhaust. Plus, we guarantee it fits like your factory crossmember without modifying the installation location. In addition, they have a bolt-to-frame design that eliminates the need for welding or cutting to make the crossmember fit.

A G Force crossmember and adjustable transmission mount is a great combination for your next swap. Our team of experts is happy to guide you through your purchase. We’re available to Chat or give us a call at 330.753.5300.

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