I've now run mine on 35's for nearly two years and added the stress of a front locker about a year ago. I've grenaded one CV while trying to climb a vertical wall on Steelbender trail in Moab while having my steering turned full left, so I suppose I deserved that grenade trying that manuever while locked in front, I should have expected it.
I've noticed no additional wear on my balljoints or tierods, but the tierods are fairly new and were replaced with the steering rack (see below) so I may be wearing them out faster and they are too new for me to know it yet.
I'll second what Jefe said about the steering rack and crossmember. I have cracked my steering rack right in half, and I have also pulled the rightside steering rack/crossmember bolt right out of the crossmember by ripping a 2-3" circle of metal surrounding the bolt. Msupertek welded it back together for me in Dallas while Ashli and I were returning from Moab back to South Carolina.
I wheel mine fairly hard; if I stuck some bigger tires on it than I already have, I believe I'd have to take a lot of care while turning against rocks and quit muscling through obstacles or I'd be ripping a lot more steering racks in half and crossmember metal apart.
Keep in mind I'm locked in front - I'm probably stressing the steering much more on 35s than open on 37s would, so it might work for you... but like I just wrote, I'd take care on the trail and not muscle the steering when you're pinned against rocks and stuff.