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Mod | | | Forums66 Topics128,064 Posts1,055,860 Members48,428 | | 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: Apr 2005 Posts: 2,832 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,832 | For years all the U.S. auto builders used the Borg Warner OD unit. It was a 30% OD and the standard rear gear used by ford, chevy, studebaker etc. was a 4.11. This gives a 2.88 in OD which is an ideal highway gear. In underdrive the 4.11 will let even a short stroke, low torque, high winder pull good. Ones fuel mileage with these old units depended entirely on the driving habits of the operator. The govenor would let the OD engage at just under 30 mph and if used like this even big V8's would get respectible mileage. With that said a 3.23 might be a little shallow but give it a try.
Evan
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