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BUSY BOLTERS Are you one?  The Shop Area
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Jul 21st, 2025 | | | | Joined: Dec 2019 Posts: 36 Wrench Fetcher | | Wrench Fetcher Joined: Dec 2019 Posts: 36 | Has anyone used a 57 chevy passenger car rear end in their 55 2nd to 59 chevy 3100. I believe the passenger car rear is 2 inches shorter drum to drum . I have one available to install in my 56 3100 stepside and wondered if it would work without clearance problems wheel width etc. I am going to use rally wheels Thanks for replys
Last edited by Fiddlerpin; 01/30/2020 6:10 PM. Reason: typo
| | | | | Joined: Dec 2019 Posts: 36 Wrench Fetcher | | Wrench Fetcher Joined: Dec 2019 Posts: 36 | | | | | | Joined: Mar 2004 Posts: 6,189 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,189 | Since no one has responded it might be time to break out the tape measure and see it the two rears are the same width wheel mating surface (WMS) to wheel mating surface (WMS)... The spring perches might need to be relocated as well because of pinion angle and/or spring width... Let us know what you find! Mike B  | | | | | Joined: Mar 2019 Posts: 1,003 'Bolter | | 'Bolter Joined: Mar 2019 Posts: 1,003 | There are also offset wheels available from varios venders if you find that being the only deal breaker. | | | | | Joined: Feb 2001 Posts: 1,094 'Bolter | | 'Bolter Joined: Feb 2001 Posts: 1,094 | I think the car rear end has the spring mount on the bottom of the housing , and the truck mounts on the top.
Tommy
59 apache 1/2t
261 short stepside
| | | | | Joined: Dec 2019 Posts: 36 Wrench Fetcher | | Wrench Fetcher Joined: Dec 2019 Posts: 36 | The original truck rear is 62 inches flange to flange and the 57 pass car rear is 60 inches flange to flange. Just wanted to know if anyone here has done this swap with this rear. | | | | | Joined: Aug 2019 Posts: 240 'Bolter | | 'Bolter Joined: Aug 2019 Posts: 240 | Sounds like it could be a great experiment! Assuming it's a 55p differential instead of a 55t, the ring gear is a bit smaller, but doesn't sound unreasonable when you look up ring sizes in other trucks. Looks like there's a wonderful variety of ring & pinion ratios currently marketed for the car axle instead of just 3.38 for the 55t. https://www.drivetrainshop.com/GM_55P_55T_s/106.htm
'59 Chevy Suburban, NAPCO
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