60-2 is the semi floating dana 60 rear end found in rare j20's with quad and in j4000's.
60-2s were never used in the J20s; The J20s all had the full-floating Dana 60s. The last year the 60-2 was used was in 73 on the "heavy" 1/2 ton J2000/4000s. They had a 5 on 5.5" lug pattern like the 5000 GVW J trucks.
Patrick V.
Valparaiso, IN