[GMCNUT]

Originally Posted by BarryGMC

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.

I should have read this before posting my latest questions - this is a HUGE Help. I will have to wait until I get delivery of the 64 truck which is about 2 weeks off yet to determine whether mine is a Dana or Eaton, but it sounds like a Dana w/ Powerlock but not sure....this is all so different than my 1/2 tons so I am going to enjoy learning a lot of new GMC information from you guru's about these heavier duty trucks and their differences to the 1000 series counterparts....thanks again Barry