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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: Oct 2013 Posts: 34 Wrench Fetcher | | Wrench Fetcher Joined: Oct 2013 Posts: 34 | My build is a 49 3100. Found a great 55 235 and SM420 for minimum modification after finding 216 engine bad. The engine that came with truck was not original and had no SN anyways. Can you veterans recommend a rear end to go with this engine and transmission combo? I have the original but at a minimum will upgrade gears to 3:55:1. However before buying anything from Patrick's wanted to get suggestions.
Thanks
PAtrick | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 |
Your 1955 SM420 transmission originally came set up for an open drive-shaft. Is your SM420 set up for an open or closed drive-shaft?
If you have an original 1949 3100, it would have an enclosed drive-shaft.
The 3.55 R&P conversion will get about 15% lower RPMs. Get a seals/bearing/bushings kit.
Others will advise on options for open-driveshaft rear ends.
| | | | | Joined: Oct 2013 Posts: 34 Wrench Fetcher | | Wrench Fetcher Joined: Oct 2013 Posts: 34 | The engine and transmission is set up for enclosed but its in a 3600 long bed. | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 |
OK - your first post showed 1949 3100
| | | | | Joined: Oct 2013 Posts: 34 Wrench Fetcher | | Wrench Fetcher Joined: Oct 2013 Posts: 34 | The engine and tranny are coming from a 3600 to replace 216 and 3 speed | | | | | Joined: Nov 2012 Posts: 257 Haunting the SBP since 2001 | | Haunting the SBP since 2001 Joined: Nov 2012 Posts: 257 | I have the original but at a minimum will upgrade gears to 3:55:1. However before buying anything from Patrick's wanted to get suggestions.
Thanks
PAtrick Here's a good suggestion.... You can save yourself $100 or so from retail prices by purchasing the 3.55:1 gear sets here..... http://www.jalopyjournal.com/forum/...-ring-pinion-gears.923013/#post-10823436. | | |
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