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Originally Posted by 88 Iroc Vert
i have one from an 89 gta that was 4 wheel disc.
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Im not sure if that will work or not.Here is my dilemma.I recently swapped the rear in my 89 vert with a 9 bolt disc brake pbr rear from an 89 formula.The prop valve in the vert is still for a drum rear.I know GM changed the threads on the brake lines in mid 1989 and Im not sure exactly which style threads I currently have.I currently have a 4 wheel disc prop valve from an 86 T/A and really wanted one from a 90-92 car just incase that one didnt mate up.That way Ill have both styles and wont get stuck when it gets swapped out