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I put an unknown yr posi and 3.55 ring & pinion into my a-body a couple years ago. I ran into a problem/question when installing carrier into case. The bearings on the repalcement carrier were larger OD than old. I found out from DTS that there are two sets of bearings for the carrier and case. Carrier has same size shaft/hub but cases have two different size for the cup of bearing.. The two different timken bearings sets have cones with same cone ID but the two different cones have different OD's. But it all went OK and posi works great. Holding up to 408 stroker so far.