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| | | Forums66 Topics128,022 Posts1,055,381 Members48,422 | | Most Online14,466
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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
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on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Mar 2015 Posts: 57 'Bolter | | 'Bolter Joined: Mar 2015 Posts: 57 | a few years back i replased the org motor in my 51 3100 with a 250 in line 6 t5 speed trans and camaro 323 rearend im starting to feel the need for a little more im thinking 5.3 and auto trans any thoughts or input bad or good would be helpfull | | | | | Joined: Jun 2008 Posts: 1,644 'Bolter | | 'Bolter Joined: Jun 2008 Posts: 1,644 | That 250 has got a lot of pep and should be able to push your ‘51 along nicely. Are you now wanting to race your truck?? Seems like a lot of work to make the swap, but it’s your truck.
My 2 cents worth.
Chuck
1950 Chevy 1/2 ton (all original)
1951 Chevy 1/2 ton (future streetrod)
1941 Chevy coupe
1938 Chevy coupe streetrod
| | | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | Drop the rear end ratio a little would help a lot, and lot easier.
See the USA in your vintage Chevrolet! My Blog | | | | | Joined: Sep 2011 Posts: 1,451 'Bolter | | 'Bolter Joined: Sep 2011 Posts: 1,451 | Or drop a lot since you have OD! I'd say 3.73 at least, since we have grades to pull in my part of the world I'd got 4.10:1
BC
1960 Chevy C10 driver 261 T5 4.10 dana 44 power loc
1949 GMC 250 project in waiting
1960 C60 pasture art
Retired GM dealer tech. 1980 - 2022
| | | | | Joined: Mar 2015 Posts: 57 'Bolter | | 'Bolter Joined: Mar 2015 Posts: 57 | thank you one and all the more input i get usuly the better i decide | | | | | Joined: Mar 2010 Posts: 10,270 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,270 | Drop the rear end ratio a little would help a lot, and lot easier. Doesn't he want to raise the "ratio" ? (3.73 to 1 is a higher "ratio" than 3.23 to 1). I know what you mean, I just want to make sure everyone else does. I have heard of 3.73 to 1 rear end as being described as lower "gear", and a 3.23 to 1 rear end as a higher "gear", and I am fine with that. Carl
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
| | | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | Most every one I have ever talked to says lower ratio, as in this case. I know that means lower speed ratio, not numerically as you point out  .
See the USA in your vintage Chevrolet! My Blog | | | | | Joined: Oct 2017 Posts: 214 'Bolter | | 'Bolter Joined: Oct 2017 Posts: 214 | When I saw the title I thought maybe someone was trying the Cummins Repower  .
1953 Canadian GMC 9314 w/ (factory) Chevy 235
| | | | | Joined: Feb 2019 Posts: 2 Moderated | | Moderated Joined: Feb 2019 Posts: 2 | I am planning to use the Cummins Repower on my 50 6400 | | |
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