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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: Dec 2001 Posts: 14,522 Moderator: Welcome Centre, Southern Bolters, Legion Hall | | Moderator: Welcome Centre, Southern Bolters, Legion Hall Joined: Dec 2001 Posts: 14,522 | Tim, I'm running the 3:73 under the rear of my 37 with a strong 350 engine and WAS running a 350 tranny. I hated the gas mileage and the engine rpms.
Now, I'm not recommending anything here but just saying what I did and I did it because it was available to repay a debt to me.
I got a 700R4 that is fresh built and put it in my 37. WOW, I don't know the rpm difference as I do not have a tach but I can tell you it is running a lot less rpms. It "seems" the mileage double but I have NOT actually checked it.
I have a friend that has built trannys for many years with his dad and now runs his own business. He builds just about any kind of automatic tranny and also builds them for drag cars and rails.
He recommends the later model (87 up?) 350 tranny with the lock up. I know its been said they are weak but Paul told me to let HIM build me one and I would not have to worry about it.
Tim, right now I am happy as a little pig in a slop bucket with my 700 but I wouldn't pass up a good late model 350.
Note: if you pull the 350 tranny and go to a 700 you will have to move your cross member back about 4 inches and have your drive shaft shortened.
Hope all this helps in your decision making....in the meantime drive it and enjoy it. You SHOULD show off the fine job you did.
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