TJ 44 and TJ Rubicon 44 are both 30 spline. I had a customer with a broken 10 Factory shaft in his Rubicon a week ago. I like Yukon personally.
YA WD44-30-32.0 [22.01 Lbs] (MAP $179.18)
Yukon 4340 Chromoly replacement rear axle for Dana 44, 30 spline
Yukon 4340 Chromoly replacement rear axle for Dana 44, 30 spline (26" ->34" CUT2LTH) TRIPLE DRILLED. Yukon 4140 Chrome Moly alloy axles offer a strength increase over stock while retaining a low cost. Yukon 4340 Chrome Moly alloy rear axles come with a limited lifetime warranty against manufacturing defects. This axle is for use in 2.750" brk' offset applications. Fits TJ, XJ, MJ JK & WJ rears.
If I can help you let me know.
Bobby