2012 model 4" (Superlift) system revisions are minimal, yet enough to require some new part numbers. The new and improved engine found in the 2012 JK was welcomed, but the Jeep Engineers took away some of the lifted JK’s suspension extension travel in the process. The new engine, tranny and transfer case rest in the frame at a steeper "front high" angle, plus the exhaust cross-over pipe is closer to the front driveshaft. Suspension travel must be limited, or the factory front driveshaft will make contact with the exhaust crossover pipe. Even if the exhaust is re-routed, the driveshaft will bind at the transfer case end when the suspension is at full extension.

Superlift and Black Diamond prevent factory driveshaft damage by including a unique front axle limiting strap tested to 19,630 lbs. resistance. The reduced travel is not noticeable on-road, although we highly recommend an aftermarket replacement, dual Cardan (CV) style front driveshaft for off-roading. If this type driveshaft is used, you simply discard the limiting strap and full extension travel is restored. Both Tom Wood’s Custom Driveshafts (4xshaft.com), and J.E. Reel (reeldriveline.com) offer a replacement front CV driveshaft.