Im running 38.5 boggers on the 725 and as heavy as it is the tireshave only slightly rubbed on an extreme turn with max articulation. ive wheeled it alot and even with open diffs I can go just about anywhere with it but being a 725 the back is heavier and cant crawl like the 715's can. I was in Iowa wheeling the first time with it and trying to crawl a hill the forward momentum stopped and it actually put all the weight on the rear tires causing the front end to come up off the ground and forcing me to hit the clutch and backing down the hill. boggers are good off road but not for highway use and cut hummer tires aught to work good.
I have a set of the bias ply 36 in. hummer tires and wheels that Im going to use on the 715 when I put the body on a 3/4 chevy frame this summer and im going to use the nv4500 too along with a divorced 205 and 4.56 gears and it should be good on the highway and offroad if all goes well?
as far as a front locker, Im open front and back but while riding with doug in his truck Ive only seen on time where a front locker would have been nice. i think a rear locker would be more necessary than a front in most circumstances but in my opinion, with a front locker I think you would have to be alot easier on it as the stock axles are somewhat weaker and more prone to break when all four tires arent on the ground and all the force is put on one side and not allowed to free wheel . just my opinion and now a rule to go by. LOL!
67 M725, 67 M715, 68 M715