There's 2 guys on her that use/used them on 4wd Cummin trucks. Not the typical "retread" your thinking. Hp383 93 clubcab 4wd Cummins and Fastback66 78 Crewcab long box converted to a 4wd Cummins. Run them on my wife 2001 Ram 1500 4wd also. Had them on my 2wd Ramcharger too. Replaced the first set on the wife 01 at around 45-50k with 7/32nds left only because we have to travel 30 miles to work and live up a hill