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**Captainfab** · 01-18-2011, 12:34 AM

The WMS to WMS measurement on the '63-early '70 rear differentials is 62". The late '70-'87 rear differentials are 63 1/2". If yours measures 64 3/8" that may be a '88 and up differential. Those are wider yet, but I don't remember the exact measurement. This may explain your tire fitment issues.

Edit: Another thread got me thinking....that 64 3/8" wide rear differential might be out of a Van. Van rear differentials are wider than truck rear differentials.

01-18-2011, 12:34 AM	#7
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,254	Re: rearend swap questions The WMS to WMS measurement on the '63-early '70 rear differentials is 62". The late '70-'87 rear differentials are 63 1/2". If yours measures 64 3/8" that may be a '88 and up differential. Those are wider yet, but I don't remember the exact measurement. This may explain your tire fitment issues. Edit: Another thread got me thinking....that 64 3/8" wide rear differential might be out of a Van. Van rear differentials are wider than truck rear differentials. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE Last edited by Captainfab; 01-18-2011 at 12:50 AM.