I am currently trying to replace my 1986 CJ-7 axles.  My jeep has a 350hp/375ft.lbs 350 chevy and 37" tires.  I am looking into dynatracs line of axles.  Would pro 44s work front and back, or do i need to step up to 60s?   

I would just go ahead and go with the 60's just bcause if you choosse later to upgarde bigger motor or bigger tires u won't have to spend themoney twice.  Much luck  

I'm in the same boat pretty much, except I'm still running the 258 and 35" tires. I've fried my AMC 20, not due to the tires though, there was something wrong with it when I bought it, and it crapped out while I was still running 31's. I put on the 35's and attempted to fix the rear end by replacing the pinion bearings, it worked for a bit then crapped out again. Probably my fault, but that's what you get for going the cheap route. You may want to consider a Ford 9", they're generally lighter than a D60 and can be built almost as strong, maybe stronger in some cases. D44's are probably too weak for your application already, I think most companies only recommend them for tire sizes up to 35" Just to give you an idea, Currie quoted me approx $2500 for a low pinion 9" with 31 spline, open diff, explorer disc brake kit, and all brackets ready to go. I think getting a custom built axle with an open diff is kind of pointless, but I was looking for a ballpark figure for a ready to go axle that I could bolt in. Add about another 1000 I think for high pinion, 35 spline and detroit locker. Not sure about that though.  

check out http://www.moserengineering.com/moser_interior/axletech.htm
its a calculator you can use to determine how much force your axles have to withstand, based on engine torque and gearing, and has specs for the approx size shafts you'll need.

Don't forget to include T-case gearing. the calculator doesn't have a spot for it, so do this:

1st gear ratio x T-case low ratio

and put the result in the 1st gear box on the calculator.