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| | | Forums66 Topics128,185 Posts1,057,284 Members48,467 | | 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
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Sep 2002 Posts: 24 'Bolter | | 'Bolter Joined: Sep 2002 Posts: 24 | I am TRYING To settle argument with O.G. Mechani,Like Me. Need to know if 5,13 ,515, or 5.17 were highest years in 3/4 to long bed truck. Already swapped to a 4:10 and IF I CAN GO LOWER GEARS,I WILL"EATON GEARS" are getting harder to find. ANY HELP WOULD BE GREAT.THANK YOU.....
Last edited by Justhorsenround; 02/26/2018 1:47 PM. Reason: Inappropriate language
Jimmy Gatz
| | | | | Joined: Sep 2001 Posts: 29,270 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,270 | Jimmy, What year GMC or Chevrolet trucks? There was one "medium bed" in 3/4 ton GM trucks (most/all years). There were two specs for 1950 3/4 ton truck rear axles:standard: 4.57 optional: 5.14 | | | | | Joined: May 2005 Posts: 8,878 . | | . Joined: May 2005 Posts: 8,878 | As far as I know (considering all years) the 5.14 is lowest gear, slowest.
4.10 is highest, fastest gear.
Although, there are occasionally rumors of aftermarket 3.73 gears at one time being available, I've yet to see any, not even a picture. | | | | | Joined: Mar 2008 Posts: 1,775 'Bolter | | 'Bolter Joined: Mar 2008 Posts: 1,775 | I found this link. It shows 3.90 and 4.10 available for the HO72. For what it's worth, you wouldn't see a real difference on the road with the two. Not to mention, I've never heard of anyone claiming to have a 3.90 set. Gears | | | | | Joined: Sep 2001 Posts: 29,270 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,270 | "Original year-end gear sets factory avil.from FACTORY "
I think the original poster means: "Original rear-end gear-sets available from the factory."?
We do not know the year. | | | | | Joined: Oct 2015 Posts: 406 'Bolter | | 'Bolter Joined: Oct 2015 Posts: 406 | My 62 c 30 came with a 5:38 ratio, I researched this on line and learned that they are out there but rare.
John
good planning is no substitute for dumb luck
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