Thanks guys for the info.
I may just sit tight for a while, but continue to research the 'correct' OD.
I just finished putting a Dana 70 with 4.56 in this truck this week. I was not sure that was going to work, but it did.
You can follow that post in "Big Bolts" under 'Finally, 65 mph @ 2500 rpm in my 1.5 Ton'
if you want to see the pics and the process.
Timmer