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Click on image for the lowdown. 
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Mod | | | Forums66 Topics128,165 Posts1,057,006 Members48,458 | | 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: May 2005 Posts: 8,878 . | | . Joined: May 2005 Posts: 8,878 | It depends on what ratios you have as to the difference in top speed.
Most have either a .85 or .73 overdrive, they help with top speed.
Some only have direct and two slower gears.
The 6066 link posted above has this info. And if you don't find what you need there I have a good bit of information on them, including the larger sizes.
Grigg | | |
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