Quote Originally Posted by Matt167
it depends on if the truck was a heavy duty truck or not. my dad's '72 has the heavy duty springs in the rear and factory 3.73's it's a 350/ auto from the factory. tells inside the glove box anyway, providing the tag is still there.

Ummm......I don't think the tag is still there. Seeing how there wasn't even a glove box insert when I got the truck. I can tell you that it's a long bed with 6 lugs. Common sense would tell me that the more lugs on the wheels the more "heavy duty" the truck is. All I know is that this thing is the largest vehicle I've ever owned. It BARELY fits in my garage!! It's going to look pretty mean when it's finally done though.
So, continuing with my question.....it's good to know that there are quite a few years the parts are compatable with my 65'. That should save some $$$ along the way. What's the deal though with this Mustang II kit though?