johnspd Posted February 26, 2003 Share Posted February 26, 2003 I have a '72 Olds Supreme with a BOP 8.5" rear. I am not sure of the gears it has - I found a factory application chart that states the rear should have 3.07's.My question is - Does the aftermarket make a posi-carrier that will fit into my existing housing. I would also like to upgrade gear sets for some hustle but don't want to scream on the highway. I was thinking 3.43 or close etc.Any advise from the experts would be appreciated. Link to comment Share on other sites More sharing options...
Guest Posted February 26, 2003 Share Posted February 26, 2003 I would try looking at a Moroso or Auburn unit. Try a 342 to 390 gear with that combo. Link to comment Share on other sites More sharing options...
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