"The T5 transmission is arguably not big enough for a 3/4 or 1 ton truck, they came in an S-10 pickup."
Grigg, Please tell me why you say this. I've got a T5 to put in my 3600. My rear end ratio is 4.1 and I'm using a 250 to push with. No one ever has said anything like this. Why is it OK for a 1/2 ton and not for a 3/4 ton? Is it the weight of the truck?
