Superior makes the best chromo's pretty much. CTM makes the best ujoints for the 10 bolt front. In a rear 10 bolt with chromo's you will break the R&P, locker, carrier, or worst case axletube itself before the axles. A 10 bolt front with chromo's and CTM's will move the brakeage point to the R&P, hubs, carrier, or locker.
Under hard wheeling with good gearing and lockers Chromo's are still only good to about 35-37" tires. Under moderate wheeling you might get away with 38-39" tires.
If you don't have alot of money invested in your 10 bolts (lockers, gears, etc) look into swapping to 1 ton gear if you can find it for the right price. If you are set on running 1/2 tons then figure out how hard you are going to wheel it and buy accordingly.
What is your combo? How heavy is your right foot? Where do you wheel?
I personally don't have chromo's in my 10 bolt front and have wheeled it pretty hard with 35" tires and 37" tires. Sofar I have not broken an front axleshaft. I have ruined one shortside from use but they are cheap enough to replace. I have a pretty calm driving style though and keep my right foot in check as much as possible. Check out my webshots and CK5 gallery if you want to see pics of how I use it.
Harley
P.S. I am one of those AZ guys that Stallion refered to, but I now live in Colorado.