Re: 3/4 ton 1964 rear gear ratios?
Checking a 66 owner's manual, it makes mention of the PowrLok, Positraction and No-Spin. So it does not seem GMC REFERRED THE PowrLock as a Positraction. The Powrlock can be identified by it's 4 pinion design and 2 piece split case. What applications the Positraction was used in I can't tell you but possibly Barry may know. Pete Chronis Northern Cal.
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