Prothane 7-1903 Polyurethane Motor Transmission Mount Combo Kit

The Prothane 7-1903 is an application-specific polyurethane motor and transmission mount combo kit engineered for 4WD GM trucks and SUVs. Designed as a direct upgrade over deteriorating factory rubber mounts, this kit delivers a firmer, more controlled engine and drivetrain connection that helps maximize power transfer and protect against mount failure.

Why Upgrade to Polyurethane?

Stock rubber motor and transmission mounts absorb vibration effectively, but they break down over time from heat, engine fluids, UV exposure, and road grime. Once degraded, rubber mounts allow excessive drivetrain movement, reducing throttle response and potentially causing component damage. Prothane's polyurethane compound holds its shape under the repeated stress of acceleration and high torque loads, and is highly resistant to oil, chemicals, and environmental elements that destroy rubber.

Key Features:

• High-performance polyurethane construction — stronger and longer-lasting than OEM rubber mounts
• Application-specific engineering — precision fit, not a universal or one-size-fits-all design
• Poly-locked "run-safe" internal interlock feature — keeps the engine and drivetrain secure even under extreme use
• Limits unwanted engine and transmission movement to improve throttle response and power delivery
• Resistant to oil, road grime, chemicals, and UV degradation
• Available in red or black to suit your build
• Made in the USA
• Backed by Prothane's Lifetime Warranty against defects in materials and workmanship

This combo kit includes both motor and transmission mount components in a single package, making it an efficient solution for a complete drivetrain mount refresh. Prothane's polyurethane mounts strike the ideal balance between the vibration absorption of rubber and the rigidity of solid metal racing mounts — delivering street-friendly performance with real drivetrain control.