Thanks for the good advice people. I originally changed to a 3.38 when I was building the truck so I could drive on the hiway with my sm420. I'm really not thrilled with that trans and while I was in to change a rear main seal/oily clutch I figured I'd see about options. I'll go ahead and put that trans back in and think about it. I like the idea of OD and I guess I could go back to 3.38.