Description
TH400 Heavy Duty Forward Drum, Sonnax 34554-01.
The ideal GM TH400 upgrade for any power level, features a unique combination of high-strength, light weight and a cutting-edge design to optimize transmission performance.
Racing applications quickly push the heavy, drum over its limits, with failure most common at the weak point where the shaft and drum connect. We can address the problem with a larger spline and lighter-weight, aftermarket aluminum drum. However, durability becomes a concern due to the wear of the clutch splines, shaft spline connection, and seal ring bore.
An engineered Sonnax chromoly steel drum with several lightweight features, custom-designed to significantly reduce weight and ensure reliability, results in the drum. It weighs 3 lbs less than the OE drum and is just 3 oz. heavier than a common aluminum drum. The drummaker carefully reduces the weight of the drum, maintaining strength, by ribbing its front, adding clutch splines (28 versus . 14), lightening holes, and decreasing the inner section diameter at the middle seal ring area.
- Ultra-modern drum delivers both high-strength and light weight for unrivaled performance at any power level
- Compatible with Sonnax and other aftermarket 28-spline input shafts
- Optimized for use with rubber clutch separators for applications with clean neutral setups
- The clutch spline major diameter is decreased slightly, and two sets of full-length clutch splines are added to support the clutch separators.
- Lightening holes correspond to input speed sensor locations in aftermarket cases for more accurate converter and shift data
- At high (5500+) RPM, Sonnax high RPM checkball capsule 57510-01 eliminates pressure drop. This is a solution to a common issue with OE and aftermarket checkballs.
