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Old 10-22-2018, 11:04 PM   #7
Baime
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Join Date: Oct 2018
Location: Minneapolis, MN
Posts: 35
Re: 1971 GMC C2500 rear end questions

Quote:
Originally Posted by Mike C View Post
A semi-float 14 bolt from a later truck can have gears as low as 3.23 if memory serves. It's GVWR is the same as the Dana 60 at 5500# which is higher than the Eaton in your truck which is 5200#.

This swap is fairly easy depending on your skill set. You have to be able to weld on new perches and a panhard bar mount.

I have this rear in my Jimmy from an '86 Suburban which had factory 4.10 gears. We put another in my kids Jimmy project from an '84 Suburban with 3.73 gears.
Thanks Mike C.,
So it sounds like I need to replace the whole rear end assembly, and you guys are recommending a "semi-float 14 bolt" or a "Dana 60" .

This leads to more questions:
- Are there two versions of each of these, for coil springs and leaf springs?
- What vehicles and years will have one of these rear ends?
- Is there a way for me to identify these, so I know I'm buying the right part?

A comment: My cousin thinks he has a later 3/4 ton GM rear end sitting around in his pole barn. I'm going out there to check it out. Hopefully this weekend.

Thanks for your patience on this. JP
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