| |
Click on image for the lowdown. 
====
| | | 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!
| | THANKS!
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: 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 | | | |
|
|
| |
