Whiteline Rear Positive Traction Kit – 2011-2014 Subaru WRX/STI

Whiteline Rear Positive Traction Kit – 2011-2014 Subaru WRX / STI

Firm Up the Rear Differential Mounts on the GR/GV WRX and STI
The Whiteline KDT910 is a polyurethane insert kit for the rear differential mount positions on the 2011-2014 Subaru WRX and STI (GR/GV chassis). The factory rubber mounts allow the differential to move under hard acceleration and load transitions, producing drivetrain vagueness and rear-end inconsistency. Whiteline’s inserts fill the void in the OEM mount housings, reducing differential movement without requiring full mount replacement.

DETAILS

• Polyurethane inserts for rear differential mount positions
• Reduces differential movement under acceleration and load transitions
• Improves drivetrain precision and rear axle stability on GR/GV WRX/STI
• Insert design — no removal of OEM housings required
• Fitment: 2011-2014 Subaru WRX and STI (GR/GV chassis)

Insert Design for the GR/GV Platform
The GR/GV WRX and STI rear differential uses mount housings that have void space in the OEM rubber design. Whiteline’s polyurethane inserts fill that void — reducing compliance in all load directions while preserving some of the OEM’s NVH isolation. Installation is simpler than full bushing replacement and produces a significant reduction in differential movement.

GR/GV WRX and STI Under Hard Use
The 2011-2014 WRX and STI see consistent use for performance driving — autocross, track days, and hard street use are common. Under those loads, differential movement is a real handling limitation. Firm mounts keep the differential in position under all driving loads, producing consistent power delivery and rear axle feel.

Part of the GR/GV Drivetrain Package
Whiteline offers a full range of drivetrain mounts for the GR/GV platform including transmission mounts, pitch stop inserts, and front differential mounts. The KDT910 rear positive traction kit is one component of a complete drivetrain mount refresh.

Why Choose Whiteline

Whiteline has been engineering suspension components from their facility in Australia since 1979. Every product in their catalog is developed with a clear goal: measurable improvement in handling, stability, and tyre contact. Whiteline’s polyurethane bushings, sway bars, control arms, and alignment correction kits are engineered using finite element analysis and validated on track before they reach the market. Their components are direct-fit, bolt-on solutions designed for enthusiasts who want real performance gains without fabrication or custom work.

The RallySport Take

A straightforward performance improvement for the GR/GV WRX and STI. Reduced differential movement produces immediately noticeable improvements in drivetrain feel and rear axle consistency. The install is straightforward but doing it correctly matters — clean the housing thoroughly before installation and apply grease to all polyurethane-to-metal contact surfaces. The improvement in drivetrain feel shows up immediately on the first hard acceleration run after installation.

What’s in the Box

• Polyurethane inserts for rear differential mount positions
• Reduces differential movement under acceleration and load transitions
• Improves drivetrain precision and rear axle stability on GR/GV WRX/STI
• Insert design — no removal of OEM housings required

Fitment