Sonnax performance converter mounting ring kit GM-RK-15 is designed to work with both early- and late-model GM 4L80-E, 4L85-E transmissions and utilizes the GM 245mm core. The versatility of this core allows converter builders to produce performance converters offering a wide variety of stall speeds with improved efficiency.
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.