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Click on image for the lowdown. 
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| | | Forums66 Topics128,174 Posts1,057,048 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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| | | | Joined: Nov 2006 Posts: 2,544 Shop Shark | | Shop Shark Joined: Nov 2006 Posts: 2,544 | Your truck probably has a SM420. The final ratio is 1 to 1 so changing the transmission out would require a transmission with overdrive. It has been talked about many times here and if you do a search you'll find lots of discussion about it. | | |
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