Built by Jimmy.
Driven by Passion.

Jimmy Banties is the founder and hands-on builder behind Jimmy’s Custom Speed Shop. His work is driven by a deep understanding of heavy-duty transmissions, racing performance, and the real demands placed on semi-truck drivetrains. Every transmission and slipper clutch is carefully inspected, rebuilt, and configured around the customer’s truck, application, and performance goals. From competitive race setups requiring fast, consistent power delivery to dependable over-the-road builds designed for heavy hauling and long-distance operation, Jimmy approaches every project with precision and attention to detail. His commitment is simple: provide honest guidance, quality workmanship, and purpose-built solutions customers can trust when performance, durability, and reliability matter most.

For Jimmy, every build is personal. He takes the time to understand how each truck is used, the conditions it operates in, the problems the driver is experiencing, and the performance they expect. That hands-on approach allows him to recommend and build a transmission or clutch setup that fits the application not simply a one-size-fits-all solution.