tranny
The 4r70w's are great transmissions and dollar for dollar it's alot cheaper to build a stout 4r70w than a 4r100/e40d. If you want the strongest stock transmission the e40d/4r100 is definately the one you want. I generally suggest whatever the truck has in it is the one you want to use because they aren't a simple swap to change them for each other.
Alan
Alan





