Jeep JK NP241 Rear Output Flange 1350 CV Yukon

This is Yukon YY NV241-1350CV-R, a rear output flange for the transfer case. It is made for a Jeep Wrangler JK that has had an aftermarket NP241 transfer case swapped in, and it gives you a flange to bolt up a 1350 series CV (double cardan) rear driveshaft.

Why you need it: when a JK gets a lift and a transfer case swap, the rear driveshaft angle gets steep, and a single-joint shaft at that angle vibrates and binds its U-joints. A flange output lets a 1350 CV driveshaft bolt straight to the case. It is also the usual replacement when an existing flange gets bent or its seal surface is worn.

This flange is for an aftermarket NP241 in a JK only. It is not the factory JK Rubicon or Sahara output. Check the output shaft spline count and seal size on your case before ordering, and match the bolt pattern to your driveshaft.

On the bench: support the vehicle, mark and remove the rear driveshaft, and remove the output nut. Pull the old yoke, replace the rear output seal while it is out, lube the seal surface and splines, slide the flange on and torque the nut to the transfer case maker's spec. Bolt the CV driveshaft to the flange and check the pinion angle before driving.