Currie 9 in. Crate Rear End Assemblies CR-GG135TWAB: Best Guide

Product Description

Upgrade your classic muscle car’s drivetrain with the industry-standard Currie 9 in. Crate Rear End Assemblies (Part # CR-GG135TWAB). Engineered specifically as a direct bolt-in solution for 1978–1988 GM G-Body platforms (including Chevrolet Monte Carlo, Buick Regal/Grand National, Oldsmobile Cutlass, and Pontiac Grand Prix), this heavy-duty crate rearend eliminates the weaknesses of factory differentials.

At the core of this assembly is Currie’s high-strength Centurion 9-inch notchback housing, paired with heavy-duty DOM axle tubes and finished in a durable black powder coat. Power is transferred through Currie Performance 31-spline induction-heat-treated axles, a street-friendly 3.50:1 gear ratio, and a smooth TwinTrac® helical-gear limited-slip differential. Unlike clutch-based units, the TwinTrac design requires no friction modifiers, eliminates clutch wear, and delivers seamless torque bias to both rear tires under acceleration.

Whether you are building a high-horsepower street machine, a weekend drag racer, or a track-ready pro-touring project, Currie 9 in. Crate Rear End Assemblies deliver unmatched durability, precise pinion alignment, and hassle-free installation straight out of the crate.

Product Specifications

Key Benefits

• Direct Bolt-In Installation: Retains factory G-body suspension mounting brackets, pinion offset, and wheel track width for a clean, hassle-free swap.

• Massive Strength & Rigidity: The heavy-duty 9-inch Centurion center section and thick DOM steel tubes handle high horsepower and hard launches without housing flex.

• Maintenance-Free TwinTrac LSD: Features helical gear operation with no friction clutches to burn out, chatter, or replace over time.

• Balanced Street & Highway Gearing: The 3.50:1 ratio delivers aggressive off-the-line acceleration while maintaining comfortable engine RPMs at cruising speeds.

• Complete Crate Convenience: Assembled, pre-shimmed, and ready to install right out of the box—saving significant shop labor and setup time.

 FAQ

 Does the CR-GG135TWAB require any chassis cutting or bracket modification for 1978–1988 GM G-Body vehicles?

 No. This assembly comes with factory-located upper and lower control arm mounts, shock mounts, and spring perches, making it a 100% direct bolt-in fitment for stock GM G-Body suspension systems.

 What type of gear oil is recommended for this Currie 9-inch crate rear end?

Currie explicitly recommends running standard 85W-140 petroleum-based (mineral) gear oil. Synthetic oils and friction-modifier additives should not be used, as they reduce the torque-biasing effectiveness of the TwinTrac helical-gear differential.