Drive Shafts compair Tatton Drive Shaft vs Stock short slip

These are both CV drive shafts. The top one is a cut down front XJ shaft I used for a rear drive shaft. The bottom is from Tatton Drive Shafts. The difference in the two is that the top is a short slip and the bottom is a extend slip or spline shaft. The bottom also has a flange adapter for a Rubicon express sye kit.