I thought I was going to need my rear driveshaft lengthened after I put on my new lift, but the splines arent showing any with the truck all the way in the air. It has a 4 inch shackle reversal, 1 inch zero rates, and 2 add a leafs for about 8 inches of lift. The pinion angle is actually very good too, I was surprised how much the shackle reversal angled the pinion, it looks close to perfect. I can get my shaft lengthened through a friend for nothing if I need it; hes doing the front too which had about a half inch of splines showing at full droop. If the splines arent showing at all, that means its long enough doesnt it?