With a shackle-forward arrangement, the axle travels down and back as suspension droops and up and forward as it compresses, requiring comparatively little driveshaft slip spline travel. This is opposite of a shackle-reversal suspension, which sees more travel in the driveshaft slip spline. We lengthened our stock shaft for our increased wheelbase just enough that the slip splines wouldn't separate at full-droop. However, this didn't leave enough spline to fully collapse the shaft on suspension compression, so we used 1-inch Rancho dropped bumpstops (PN RS8203) to prevent the shaft from bottoming and destroying our T-case. It's only temporary until we can have a proper long-travel shaft built.