I have a '99 XJ. It has a stock D30 on the front and I'm running 32" BFG. Other than a locker what could I do to beef up this part of the drive while adding a locker at a later time is in mind. Rear is C8.25 with PowerTrax no slip already installed.

 

Truss it. Do a V8 ZJ tie rod swap.

 

Other than 32" tires what are we talking about? D30 doesn't really need much to run 32's. What kind of wheeling do you do?
Aftermarket axel shafts front and rear. Aftermarket steering links. ZJ V8 tie rod is better than the stocker but not much of an upgrade when you bring 32's and a locker in the the equation.

 

rocky surface and forest type trails. If I was to rate them 1-10, 10 being most difficult, most would be in 6-8 range. I was thinking maybe different axle shaft or u-joints.

 

Chromo shafts.