tire sizes and 1 piece driveshaft???

[texnician01]

hey guys, what do you know even in the middle of Iraq I am still scheming about my truck! I want to put 265/75 r 15's on it. but I don't know if they'll fit. I'm getting new rims too so any suggestions on backspacing or whatever would be great. my truck is a 69 6 lug rear 2 wd w/coils.

the next question is about the one piece driveshaft. how do you get around the crossmember. do you add another brace in there and cut the bottom of the hole out? I want to put in an overdrive and then possibly a 1 piece cause with a 2 piece I would have a chunk of DS 1 foot long or so and then the rear DS.

link to the OD.
http://www.drivetrain.com/new_overdr...spdmanual.html


thanks
Nathan & Tiffany