Rear end
Hey all, the weather finally cooperated today and I got under my new truck to check what diff I have. The metal tag shows 46-13 and 3.54. Now I know that this is a GMC option 3.54 ratio. Date stamp is 63 0182, making this a 1963 built diff.
You may recall that my truck is a 1964 chevy cab and 283 motor mated to a SM-420 on a 1963 GMC chassis. The chevy factory rear ends were 3.73 standard, 4.11 and a 3.07. I need to rebuild the diff as the pinion bearing and seal are shot-and who knows what else, should I change the ratio or is this a decent combo?
Brian
Last edited by bdshumaker; March 27th, 2014 at 03:14 AM.
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