Re: 3/4 ton 1964 rear gear ratios?
That would be a 3.54 ratio for the Dana-Spicer 60 in your truck, the 3.42 ratio is for corporate GM differentials. In your application this will require a carrier change as well
You can get all the changeover parts from vendors like Reider Racing, Randy's Ring&Pinion,West Coast Differentials
,Summit Racing to name a few.
Pete Chronis Northern Cal.
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