if you have no posi and 2.73's you defintely have the 7.5/7.625" 10 bolt rear. In 88 you will probably have 28 spline axles (as opposed to earlier 3rd gens which have 26 spline). I think the switch was mid-year '87...if I'm wrong someone jump in with the right info.....
- Justin
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1999 Camry - Beigemobile DD
2002 Suburban - Wife's DD
2004 Grand Cherokee - Not running / Project / Selling?
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