HD Semi-solid gearbox mount set. Porsche 911 1987-89 G50  ❭  91137503110

Improve gearbox support and drivetrain control with this OE Match HD Semi-Solid Gearbox Mount Set. Supplied as a set of 2 mounts comprising 4 halves, these heavy-duty semi-solid mounts are designed for compatible Porsche applications where increased drivetrain stability and more direct response are required.

• Secures and supports the gearbox within the chassis.
• Is supplied as 2 mounts consisting of 4 halves.
• Provides increased rigidity compared with softer conventional mounts.
• Helps reduce excessive gearbox movement under load.
• Improves drivetrain stability during acceleration and deceleration.
• Helps provide more consistent transmission positioning during gear changes.
• Can contribute to a more direct and precise drivetrain feel.
• Helps control movement during spirited or performance driving.
• Provides a heavy-duty solution for compatible fast-road and motorsport applications.
• Replaces worn, softened, cracked or damaged gearbox mounts.
• Helps maintain more consistent drivetrain alignment.
• Provides an OE Match performance-oriented replacement solution.  

• Excessive drivetrain movement.
• Clunking or knocking during acceleration or deceleration.
• Movement or jolting when changing gear.
• Gear lever movement as engine load changes.
• Increased drivetrain movement when engaging the clutch.
• Unusual vibration from the transmission area.
• Gear selection feeling less precise or consistent.
• Thumping noises when applying or releasing the throttle.
• Cracked, split or deteriorated original rubber mounts.
• Mount material separating from its associated hardware.
• Visible deformation or sagging.
• Excessive gearbox movement discovered during inspection.
• Damage following heavy road, track or competition use.  

• Gearbox mounts must keep the transmission securely located while controlling the forces generated by the drivetrain. When conventional mounts deteriorate, excessive gearbox movement can develop.
• This unwanted movement may be felt as clunks, jolts or changes in gear lever position during acceleration, braking and gear changes. It can also place additional movement and stress on associated components such as gear linkages, hoses, wiring and drivetrain connections.
• For performance driving, excessive transmission movement can reduce the precision of the connection between the driver and drivetrain. A gearbox that moves significantly under load may contribute to less consistent shifting and a less controlled response when transitioning on and off the throttle.
• The semi-solid design of this mount set reduces compliance, helping hold the gearbox more securely relative to the chassis. This can improve drivetrain response and provide a firmer, more direct feel.
• However, increased rigidity also means less isolation between the drivetrain and vehicle body. As a result, more mechanical noise and vibration may be transmitted into the cabin compared with standard rubber mounts. This characteristic should be considered when choosing semi-solid mounts for a road vehicle.