2001–2010 LB7/LLY/LBZ/LMM Duramax Polyurethane Transmission Mount Bushing 31129R

Replace your worn or broken factory rubber transmission mount with the Energy Suspension 3.1129R Red Polyurethane Transmission Mount Bushing, designed for 2001–2010 Chevrolet Silverado HD and GMC Sierra HD trucks equipped with the 6.6L Duramax diesel engine and Allison 1000 transmission.

Energy’s Hyper-Flex polyurethane mounts are the perfect balance of strength and comfort — soft enough for street use yet strong enough for racing or off-road. Unlike GM’s rubber mounts (which have been unchanged since 1956 and lack a safety locking feature), this mount uses a patented metal interlocking design that effectively controls torque and resists drivetrain damage.

Features & Benefits:
- Genuine Energy Suspension performance mount
- Hyper-Flex polyurethane resists fluid and road contaminants
- Stronger than OEM rubber mounts while still absorbing vibrations
- Maintains proper driveshaft angle to prevent premature wear
- Unique safety interlock design prevents torque-related failures
- Direct bolt-on replacement — installs like OEM

Part Numbers:
Energy Suspension #: 3.1129R (Red)
OEM Replaces #: 15113135, 15031704, 15068560
UPC: 703639052104

Vehicle Fitment:
2001–2010 Chevrolet Silverado 2500HD / 3500HD (6.6L Duramax w/ Allison 1000)
2001–2010 GMC Sierra 2500HD / 3500HD (6.6L Duramax w/ Allison 1000)