Key Features
- Converts 16mm x 1.5 threaded shift knobs to fit 5/16-18 shift levers
- Includes precision-machined thread adapter insert with matching jam nut
- Two-piece design locks securely to prevent loosening during aggressive shifting
- Compatible with classic muscle cars, vintage imports, and transmissions using 5/16-18 threading
Description
This thread reducing insert solves the common fitment problem when you want to run a modern 16mm aftermarket shift knob on a transmission with a 5/16-18 threaded shift lever. The precision-machined adapter threads into the shift knob's 16mm socket, then the included jam nut locks everything in place on your lever.
The 5/16-18 thread pitch is found on various classic applications including early Corvettes, Camaros, MG Midgets, Mini Coopers, and certain Gennie shifter setups. The two-piece design ensures a secure connection—the insert provides the thread conversion while the jam nut prevents any loosening during spirited driving.
Installation is straightforward: thread the insert into your 16mm shift knob until snug, slide the jam nut onto your shift lever, then thread the knob assembly onto the lever and tighten the jam nut to lock it in position. This simple adapter eliminates the need to hunt for period-correct knobs when you want modern ergonomics and style on your classic transmission.
Kit Includes
- Thread reducing insert (16mm x 1.5 external to 5/16-18 internal)
- Jam nut (5/16-18 threading)