Because I moved the suspension forward nearly 2 inches and added the shackle-reversal setup, the stock driveshaft would no longer work without a bit of modification. I lengthened the 1.25-inch diameter shaft by cutting it and sleeving it with a section of 11/2- inch, 0.120-wall DOM tubing. I then loaded the shaft with new Spicer U-joints (PN 16585.02) from Omix-Ada. The DOM tubing was a tight press fit, so the shaft has very little runout. I made sure to double-check the suspension uptravel so the shaft wouldn't bottom and destroy the T-case. I wound up using a pair of '07 Dodge Ram 2500 rear bumpstops to cheaply limit the uptravel an additional 1-inch more than the factory bumpstops.