Description
TH400 Smart-Tech® Drum Module, Sonnax 34555-01K.
For racing applications that do not use front band.
Sonnax Smart-Tech drum module 34555-01K for racing GM TH400 transmissions improves on-track performance and consistency, leading to quicker ETs, more wins and greater reliability.
The two-speed Powerglide is less preferred due to its lack of overall durability and fewer available ratios. Other options are less preferred because they have inferior durability and fewer ratios, in contrast to the TH400, which is heavier and less efficient but still preferred due to its superior durability and greater number of ratios. Part of the TH400 inefficiency results from the fact that the direct drum counter rotates, spinning backwards in 1st Gear, brakes to a complete stop on the 1-2 shift, then goes from 0 RPM to input RPM on the 2-3 shift. This cycle wastes significant energy, causing power loss, disrupting traction during shifts, and leading to broken internal parts.
Compared to aluminum direct drums, the Smart-Tech drum module reduces the weight of the counter-rotating components by over 3.3 lbs! During the 1-2 and 2-3 shifts, the Sonnax counter-rotating parts, which have a weight closer to the centerline, require LESS energy to stop and restart. The benefits are increased wheel horsepower, better acceleration, less shock on the shifts and improved durability.
- Complete kit replaces both forward and direct drums and includes everything from intermediate sprag to the pump; a selection of Sonnax input shafts is available separately
- 100% new content, no used core pieces
- Includes larger-diameter, 36-element sprag and sprag race that works with OE intermediate clutches
- Includes six-friction forward clutch pack and seven-friction direct clutch pack
