For sale, a complete 12 bolt positrack rear end housing with 3:55 gears. Fits 1968 and newer Chevelle, Beaumont, GTO etc. A body cars. Rear end has been rebuilt and is ready to install. Unit can also be installed in a 1967 and earlier simply with the addition of slightly offset rear tire rims. I believe the overall width in only 3/4" wider than the rarer and pricier 67 and earlier differential.