1978 GM Chassis Rear Diff ID needed... - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat

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Old 06-15-2010, 03:40 PM   #1
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Default 1978 GM Chassis Rear Diff ID needed...

1977-78 GM Chassis Class A Motorhome with 454 and 4.56 rear end.

Need ID of rear diff. I can find no numbers/stampings to ID the rear end.

I count 14 bolt. Could be a 10.5" corporate or an 11" Dana? Any other idea'*? Does the option code mean anything?

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Old 06-22-2010, 04:00 PM   #2
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Default more pics please

My initial guess is it'* a corp 14, I have been a truck mechanic for 15 years or so now. Can ya take a pic of the end of the axle shaft like as if you were looking at the tire? Also, if you take the axle shaft out if I remember correctly the dana/gm diff will have different axle nuts if u get me that info I can tell ya for sure.
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