These Holley steering shaft kits were designed to replace a worn stock one on your 2nd Gen F-Body vehicles or with an engine swap where additional clearance may be needed. With a 16 3/4" collapsed length, 23 1/2" max extended length, strong DD style steel shafts, and dual u-joints (1" x 48-spline top column joint and 3/4" 30-spline lower steering box joint), there is plenty of adjustability for your project to ensure everything is exact and safe.