I can do that on the one that I would be getting, but I wouldn't be able to on the one out of my truck as it has already been gutted (not by me!). I just have the casing.

Ok - so how would I know which one of those would be appropriate for my truck. As I have said before, it has a 235 and 3 speed trans.

What kind of difference would it make putting in a rearend with a different gear ratio than the original?

And thanks for all the replies. I'm very thankful I found this site!!!