Drive shaft – Standard Duty, With 27 spline yoke, M20, M21, M22, Turbo 350, Power Glide transmissions. Measures 55 1/2” and comes with 1310 rear U joint which measures 3 1/4” cap to cap. Fits 1968-72 Chevelle / El Camino / Cutlass / GTO / LeMans / Skylark models. New factory tapered down swedged drive shaft. These new drive shafts feature the same shape and design as GM, unlike the aftermarket straight tubing. These drive shafts have tapered down tubes on either end. The drive shaft tubes are semi-polished bare steel, fully machine welded, end caps with factory style bluing on the ends, then clear coated to preserve the natural appearance. Totally balanced, they come complete with new slip yoke and fully greasable U joints. Mounts on the yoke of your rear end. Lengths are measured center to center of rear U joints, of which we offer two styles: 1310 and 1330. The measurement of the yoke of your rear end is required to get the proper fit of the drive shaft