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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: Dec 2007 Posts: 10 New Guy | | New Guy Joined: Dec 2007 Posts: 10 | I posted a little while back for info about a two speed rearend. Since then I have found a Brownie Model 42 that I am thinking about going with instead. This has an underdrive, direct and over drive. The over drive is .83:1
Can anyone out there give me an idea if a .83:1 overdrive will transfer into a noticable difference in my top road speed?
Thanks
David | | | | | Joined: Oct 2003 Posts: 5,152 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Oct 2003 Posts: 5,152 | That will produce about a 17% increase in top speed. So if top speed now is 50 it would increase to about 58.
1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more...
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