Transmission Swap Question

[Jrainman]

Originally Posted by hugger6933

If you use you3/4 ton like a 3/4 ton, you want to look into the 4L80E trans but here is the downside, it has to have its own controller. Those can run you in the $300 to up on the controller and each do nothing without it. I 4L80E is built stronger from the factory than a 700R4 that has been Modded to some small degree but can take plenty abuse.
So if hauling or towing get the 4L80E. Lots of drive line places can do a drive shaft using what you have for less than a hundred bucks, Jim

I agree here with Hugger , also with the 700R4 you will have to add kick down linkage , the TH400 is a strong trans that's why its in your truck and has been for over 40 + years

if its just fuel economy your after have you thought about changing your diff gear ratio . you could gain a couple MPG and even more depending on your drop in ratio.