A performance torque converter is highly specialized based on the performance characteristics of the specific vehicle. Sonnax has several levels of kits to ensure the best combination of performance and value for each application. These patented, powerhouse kits can be built in a variety of stall speeds, and offer fast, easy assembly with predictable tuning adjustments.
Sonnax JMBX performance converter kit GM-RK-685 for GM 6L80/6L90 (JMBX) applications delivers the performance characteristics of a high-stall with maximum lockup capacity.
Designed from the ground up to outperform OE and other aftermarket components, other kits that utilize GM 245mm or 258mm core are available.
Includes Sonnax base kit [GM-RK-20M].
Designed from the ground up to outperform OE and other aftermarket components, Sonnax has you covered with a full line of performance converter kits for gas and diesel vehicles. Offering the widest variety of options in the aftermarket, these innovative kits deliver customized performance and value.