The AMC model 20 rear axle was the standard axle on cjs from 76-86 and were on some waganeers and maybe some 70,s cherekees (not sure about the cherekees tho). As stated above in 86 dana 44,s went in some of the cj,s. The 20 is considered stronger than the 44 by some because it has a larger ring gear. The axle tube are weak, (hense the truss) and it has a two peice axle design that is weak, but can be cured with one peice shafts. I had a one peice axle model 20 with a locker and ran it HARD for about 10 years with no issues. The yj axles are about 3" wider total I believe.