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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: Jan 2007 Posts: 18 Wrench Fetcher | | Wrench Fetcher Joined: Jan 2007 Posts: 18 | My plans of updating my '57 LCF, 2 ton is.... I want to use a new 350 Goodwrench motor, Auto Trans., and use the original rear-end.
My question is....What auto. trans. would be the best to use???
Am I thinking right by using the 350, Auto. Trans., and locking the rear-end in the high side, as I'm never going to have a load on the truck. Any and all tech. help would be great!
Warren L. Seiz Phoenix,AZ
| | | | | Joined: Sep 2006 Posts: 1,276 Shop Shark | | Shop Shark Joined: Sep 2006 Posts: 1,276 | Due to the very low rear end gear ratio in your truck and the slip of the torque converter of an automatic I would use an overdrive transmission if I were you. Your best bet would be a 4L-80 they are much like a turbo 400 but with a 4th gear overdrive. They can be found in mid 90s to present Chevy and GMC ¾ to 1tons and there are even stand alone computers for the electronic models. In my opinion you would be disappointed in the performance of your truck with t turbo 350 pushing though them low gears. | | | | | Joined: Feb 2002 Posts: 12,029 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Feb 2002 Posts: 12,029 | what Grant says ... the 4L80 is the OD update of the TH400, and the TH350 wouldn't hold up long on a heavy truck
Bill | | | | | Joined: Nov 2006 Posts: 2,544 Shop Shark | | Shop Shark Joined: Nov 2006 Posts: 2,544 | You could also put in an Allison automatic. | | |
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