I'm trying to ID my front axle. I've got a 1991 4wd Explorer w/ 4.0 V6, and I'm replacing all 4 ball joints. When I went to the parts store they asked if I had a Dana 28 or Dana 35 front axle. There is no tag or other markings on the axle itself to help with identification, and my Chilton's manual is unclear. Any help is appreciated.