Cluster Gear for GM 3 Speed 1958-63 Transmission 25-14-21 Tooth Count WT266-8A,1958-64 Chevrolet Pickup 1/2 Ton 3-speed Manual Transmission,363 CUBIC INCH BOSS SHORT BLOCK M-6009-363,1963 Chevrolet Chevy II V8 4.6 283,1958-64 Chevrolet Pickup 1/2 Ton 3-speed Manual Transmission