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Rear Housing Support - Allison Transmission | 2011-2019

2 Reviews
SKU: 10357

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The Merchant Automotive transmission Rear Housing Support can help prevent the 4WD Allison transmission housing from cracking in the event of excessive driveline vibration. These vibrations can be caused by something as simple as a failing U-joint or as complex as a driveshaft imbalance from a dent or even a bend. Also remember that the transfer case itself is heavy and is only supported by being bolted to the back of the transmission, installing the Rear Support Brace provides additional support for trucks that are used off road and in harsh conditions where the weight of the transfer case alone can cause cracking and damage to the transmission case.

Features & Benefits:

  • Peace of Mind: Installing the Merchant Automotive Rear Housing Support can keep the Allison transmission housing from cracking, potentially saving $1,000 or more to replace a transmission housing that is cracked or damaged from driveline vibration.
  • Built to Last: Our Rear Housing Supports are fabricated in-house and precision welded using state-of-the-art robotic welding equipment at the Zeeland, Michigan Merchant Automotive facility. The support uses high-quality 3/16-inch plate steel that is precision laser cut to ensure exact fit on the transmission and transfer case within each truck. The plates are linked together with 7/8-inch 0.120-inch wall thickness DOM mild steel tubing for MAximum support backed by the Merchant Automotive Limited Lifetime Warranty.
  • Easy to Install: The Rear Housing Support can easily be installed in your garage or driveway using basic hand tools and the factory bolts.

Click here to view the installation video.

Click here to view the Truck U segment on the MA Rear Support Brace.

Click here to view the Two Guys Garage segment on the MA Rear Support Brace.

While you are improving the driveline stability with the Rear Support Brace consider installing the Merchant Automotive High Performance Motor Mounts and Polyurethane Transmission mount to really lock down the complete drivetrain solidly in the truck's chassis.

Click here to see the MA fabricated Motor Mounts.

Click here to see the MA Polyurethane Transmission Mount for 2011-2016 trucks.


GM Duramax 2500HD 3500 Silverado & Sierra 6.6 V8 Diesel Trucks with Allison 4WD Transmissions

2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019

Ratings & Reviews

2 Reviews

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X-Fer Case Support

Anthony - | 02/01/2018 12:01:00 pm

I have put 2 of these on my personal trucks, an 05 2500HD and my current 2013 2500HD. Took less than 1 hours to install. Fits like a molded glove. From watching other trucks without one and what ensues after a u-joint failure or a rock ding in the drive shaft I BELIEVE That this is WORTH the Piece of MIND!!!!!!

Installation not as easy as videos make it out

LeRoy - | 09/17/2017 12:01:00 pm

Just installed this on the 2017 Silverado 3500 HD High Country Dually L5P and it took a solid three hours. I installed it in the driveway with the front wheels on a pair of ramps. There's not nearly as much room to work as in the online videos. There was a lot of blind feeling for bolt heads during both the preparation and installation. Installing and torqueing the driver-side upper transmission bolt was probably the most difficult part of the entire procedure because of the angle and the clearance. All of that said, I believe it was worth it for the peace of mind. The brace is solidly built and fit perfectly once I got it up there.