I'm goin hunting soon. My question is would it be wise to air down the fronts with chains on? Seems to me I wouldn't have to. Thinking just the rears aired down would work...Im running 33's if it matters

 

I wouldn't air down with chains on the front or the rear. Chains on aired down tires are bad you stand a chance of breaking the sidewalls. Air down or Chains not both.

 

Also, air down all 4.. not just front or rear. When you are locked in 4wd the tcase is trying to spin the front and rear driveshafts at the same speed. When only one set of tires is air down it creates a different tire diameter and turns at a different speed. This will cause damage to the Tcase.

 

I realize this is old, but if you're on a surface where you need the 4wd and chains, this won't matter. The snow/dirt/mud will allow the tires to spin at different rates. If you get back on pavement then you won't need the 4wd so it won't matter, and if you have full time 4wd that you can leave engaged, well it still won't matter since you have a center diff. If the different air pressures mattered, you'd be screwed anyway because the first turn you'd make would blow the T-case up long before the different relative tire diameters built up enough load in the T-case.