Re: 3/4 ton 1964 rear gear ratios?
60-66 gmc 1500 trucks use a dana 60 rear. the gear tag will read like this 4.09 or 45-11 or sometimes both of these #s if it is a 4.09 ratio. a second tag will have the limited slip oil only on it. these tags are not always present however. They often broke off or were not put back on. The Eaton ho52 is a chevy 3/4 ton and one ton single wheel rear that was only used on gmc 2500 series. The eaton tags appear to be a part # tag, I have never seen a gear ratio tag on an eaton. Factory option for the dana 60 is the power lock limited slip, and the detroit no spin for the eaton. BTW the detroit is not a positraction it is a mechanical locking diff , the wheels can not go slower than the driveline. differentiation occurs when the outside tire goes faster than the driveline.
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