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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: Sep 2001 Posts: 29,270 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,270 |
If you are asking if taking out an original 4-speed rear-end and replacing it with an original 3-speed rear-end, there will be no change in RPM - both have 1:1 drive in high gear.
The 3.55 Ring & Pinion conversion sold by Patrick's is one way to lower RPMs (you have a 4.11 rear end).
I do not know about a way to change the "whole pumpkin" (maybe someone else will post a reply on this). You could change out the drive-shaft and the rear-end/axle/etc (which would necessitate a change in transmission, because you would be eliminating the torque-tube).
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