Transmission Back Cutting Services



Available for 5-Speed Big Twin, Sportster and Buell

The Experts at Zipper’s have created transmission products and services to greatly improve the shifting performance in any 5-speed Big Twins and Sportsters® Transmission.

Zipper’s best in class series of Billet Doors provide superior structural integrity and support to the transmission. The Experts at Zipper’s have also developed back cutting to gears to ensure effortless shifts in any riding condition.

New gear racks are available complete ready to install or you can ship us your trans-rack to develop a quote from your core.

Click here to complete a Services Inquiry Form, and a Zipper's Representative will be in contact with you.