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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Jan 2008 Posts: 4,962 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,962 | It is probably GM because I think they are the only ones that used vacuum shift. It could very well be original in a 64 60 series. | | | | | Joined: Jul 2008 Posts: 326 'Bolter | | 'Bolter Joined: Jul 2008 Posts: 326 | Here's my guess if the differential wasn't changed out over the years.
If it has 15x4 brakes (15K axle) it could be a 6:40/8.72 or a 5.83/7.95.
With 15x6 brakes (17K axle) it could be a 6.40/8.72.
These were the popular two speed axles during the mid sixties on GM medium duty trucks.
SimS | | | | | Joined: Sep 2011 Posts: 7 'Bolter | | 'Bolter Joined: Sep 2011 Posts: 7 | Thanks SimS. I saw that data on this site someone else linked me to. That's why I noted that I forgot to look at the drums. http://www.chevyc60.com/the_rear_axle_page.htmI thought the numbers on the pinion support were supposed to be the pinion and ring tooth count, but I don't know how that would work with the additional gearing in the rearend. I also thought that the 2-speeds were all Eatons. Was I wrong? Are they Corporate? Either way, is there a model number for the axle so I can refer to it somewhat intelligently when looking for parts? | | |
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