Ok i picked up a Auburn Posi unit today out of a 10bolt lt1 firebird and was going to use it in my 88 bird but found out that the axle splines dont match up so was wondering if i would be able to put it into my 87 2.8l 4x4 blazer the diff. is for 28 spline axle and i was told that the 89 would have 28 spline axles too??