Bro, I've been running my D35 locked for 4-5 years now with no problems. Agreed, they are not real strong but I'm running 33"s without any issue. Think about it, if you're not going any taller that 33"s and are'nt going to be jumping it, then you should be ok, remember spare shaft's are a dime a dozen. If you wanted to, it could be trussed for extra strength as well as upgrading the shafts.
. If you feel you "need" a 44, well thats fine, it's just an added layer of protection and a bit more money.
As far as the front goes, you may get a little feedback from the locker during tight turns at low speeds but that should be it. Personally I'd upgrade to TJ shafts and a locker and call it good.
I feel it's all a matter of preference myself.