CRC Trans-X Posi-Trac Limited-Slip Gear Oil Additive — 7 fl oz, reduces differential chatter & smooths clutch engagement

CRC Trans-X Posi-Trac is a 7 fl oz limited-slip gear oil additive engineered to stop differential chatter and improve the smoothness and protection of GL‑5 gear oils.

Trans-X Posi-Trac is an aftermarket friction modifier designed for use with conventional or synthetic GL‑5 gear lubricants. It reduces the stick‑slip behavior that causes noisy, chattering limited‑slip differentials while helping lower wear and heat under load. This compact, easy‑to‑use bottle meets vehicle manufacturer specifications from GM, Ford and Chrysler, making it a practical addition during routine differential service or when treating noisy units.

How does Trans-X Posi-Trac stop differential chatter?

The product modifies the friction characteristics inside limited‑slip differentials so clutch plates move smoothly rather than locking and releasing abruptly. That change in friction behavior eliminates the high‑frequency slip events that create the typical chatter sound.

• Introduces a controlled friction modifier to the gear oil film
• Smooths clutch engagement to prevent stick‑slip noise
• Reduces rapid surface temperature spikes linked to chatter

Will this work with my gear oil and vehicle?

Yes — Trans‑X Posi‑Trac is formulated for use with both conventional and synthetic GL‑5 gear oils and is compatible with common limited‑slip clutch systems. It meets GM, Ford and Chrysler specifications, so it’s suitable for most passenger cars, trucks and SUVs that call for GL‑5 lubricants.

• Compatible with GL‑5 rated gear oils, conventional or synthetic
• Meets major OEM specifications for wide vehicle coverage
• Intended for limited‑slip differentials, not for manual transmission friction plates

How do I use the 7 fl oz bottle during service?

The bottle is sized for addition during differential fill or top‑off procedures; follow the vehicle manufacturer’s recommended dosage for your axle capacity. Typically you add the additive to the gear oil reservoir and operate the vehicle briefly to distribute it evenly through the differential.

• Add during a gear oil change or when topping off the differential
• Observe manufacturer dosing instructions based on axle capacity
• Drive short distances to ensure the additive blends through the gearset

What performance benefits can I expect after treatment?

After proper addition and distribution, users commonly notice reduced noise and smoother limited‑slip operation. The formulation also helps reduce frictional wear and can lower operating temperatures under load, which supports longer gear life when combined with routine maintenance.

• Quieter differential operation and reduced chatter
• Smoother torque transfer through the limited‑slip unit
• Less friction, wear and heat during heavy or repeated use

Who is this for: CRC Trans‑X Posi‑Trac is aimed at vehicle owners, professional technicians and DIY mechanics who experience limited‑slip differential chatter or want to optimize gear oil performance. It’s a compact, OEM‑spec additive well suited for cars, trucks and SUVs using GL‑5 gear lubricants and for anyone wanting a straightforward treatment to reduce noise and improve clutch engagement in limited‑slip axles.