When you’re building a performance muscle machine or street rod, you don’t want to settle for an off-the shelf automatic transmission. To finish your drivetrain right, you need a transmission custom built for your car or truck and Gearstar is ready to build you the right transmission.
One of the most popular GM automatic swaps today is a fully electronic 4L60E, however Gearstar recommends the stronger 4L75E. The 4L75E fits in place of the 60E yet is capable of handling more power and torque, especially when Gearstar is finished with it.
The Gearstar Level 4 4L75E is upgraded with a 300M input and output shaft along with a high capacity pump with durable Torrington bearings. A hardened sun gear shell and drum are fit with premium Kolene clutch packs and a special carbon-fiber 2-4 band is integrated. One of the most noticeable seat-of-the-pants upgrades is a closer ratio first gear (2.84 instead of the stock 3.06) from Sonnax which helps keep the engine rpm in the sweet spot.
Each transmission is built by one tech from start to finish and is finished with a new 258mm forged billet, multi disc, lock-up Converter specifically built to match your needs. Each converter is electronically welded, balanced and dyno tested with the transmission to the equivalent of 100 miles before being shipped!