Description
Product Overview
The Energy Suspension 3.1129R Large 7.5 CC Transmission Mount is engineered for GM vehicles, delivering a robust solution where rubber bushings often fail. Constructed from high‑grade Hyper‑Flex polyurethane, the mount resists oil, road salt, heat and other contaminants that degrade traditional rubber components. Its compact dimensions (9.8 x 5.31 x 3.58 inches) and weight of 2.1 pounds make it a direct fit for original equipment mounting points, while the plastic housing adds structural integrity without adding excess mass.
Usage
Designed for unisex‑adult drivers of cars, trucks and SUVs, this mount excels in daily commuting, performance driving and off‑road conditions. Whether you are restoring a classic GM model or upgrading a modern performance build, the 3.1129R provides consistent torque absorption and vibration dampening. 
Why Choose Us
Energy Suspension brings over two decades of in‑house polyurethane expertise, ensuring each component meets rigorous performance standards. The Hyper‑Flex material is race‑proven, offering superior compression resistance and a longer service life compared to standard rubber. Backed by a manufacturer warranty, this mount delivers confidence for both DIY enthusiasts and professional mechanics.
Key Features
- Hyper‑Flex polyurethane resists oil, salt and heat for extended durability
- Direct OEM fit for GM transmission systems, no modifications required
- Lightweight plastic housing reduces overall vehicle weight
- Engineered to handle high torque loads without permanent compression
- Backed by Energy Suspension’s warranty and proven track record
FAQ
Is this mount compatible with all GM models?
The 3.1129R is designed for a wide range of GM vehicles that use the standard 7.5 CC transmission mount size. Verify your vehicle’s service manual for exact fitment.
Can I install the mount myself?
Yes, the mount bolts directly to existing mounting points using the original hardware. Basic hand tools are sufficient for installation.
What is the benefit of polyurethane over rubber?
Polyurethane maintains its firmness under extreme temperatures and resists degradation from oil and road salts, providing a longer service life and consistent performance.
Does the mount affect vehicle ride quality?
The mount’s vibration‑dampening properties improve ride smoothness by reducing transmission‑induced harshness, especially during acceleration and gear shifts.
What warranty does Energy Suspension offer?
The product includes a standard manufacturer warranty covering material defects for the period specified in the warranty documentation.








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