Rear end swap '90 12 bolt into '71 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

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Rear end swap '90 12 bolt into '71

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07-09-2008, 12:49 AM	#1
LEEVON Moderator Join Date: Jul 2006 Location: Ozark, MO Posts: 4,893	Rear end swap '90 12 bolt into '71 My cousin has a low mile 12 bolt posi 3.73 rear end from a '90 454SS truck for sale and I'm thinking of replacing my factory open diff 3.73 rear. Does anybody know if the width is compatible with the factory '71 1/2 ton 5-lug? If it is the same or very close, would I just be looking at adding the coil spring perches / removing leaf perches? Thanks in advance! __________________ '86 GMC C30 Crew ~ '86 C20 Crew ~ '79 K15 Sierra Grande ~ '76 Blazer 2wd ~ '74K10 ~ '71 Cheyenne swb ~'50 3100 bagged ~ '80 Wife ~ Late model kids

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