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| | | Forums66 Topics128,175 Posts1,057,055 Members48,460 | | 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!
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| | | | Joined: Jul 2011 Posts: 74 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2011 Posts: 74 | I would like to get this 4 speed tran. up to speed. It is just geared to slow to go from town to town an stay with the group I would like to go with. I have a 1 ton 48 chev panel and the first gear will not get me across the street. Do you know what is in the truck and what I should go to. Thanks for your help. | | | | | 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. | | | | | Joined: May 2005 Posts: 8,878 . | | . Joined: May 2005 Posts: 8,878 | Also consider axle gears and or a whole newer rear axle. Taller tires also help with speed. | | | | | Joined: Apr 2002 Posts: 1,571 Shop Shark | | Shop Shark Joined: Apr 2002 Posts: 1,571 | The 4.10 rear differential from a 67-72 truck that used the same "banjo" style axle will improve your top speed significantly. 1-tons came from the factory with 5.14 gears. | | | | | Joined: May 2005 Posts: 8,878 . | | . Joined: May 2005 Posts: 8,878 | | | |
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