Depending on how hard you plan on wheeling the D30 will last. I would not recommend putting a locker in the front due to the ring size. Additionally stay with chromoly shafts. Once you re-gear your weakest link is going to be the ring and pinion.
I posed the same question in a pm and was given the same advice. As long as you do not plan on doing any rough rack crawling and locking the front you should, and use that lightly, be ok.
I would say stick with the 35's until you upgrade your axle.
R/
Will
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