Your front Dana 30 is strong enough for a locker & 33" tires but in stock form, your rear Dana 35 axle's axle shafts are not. The Dana 35's factory 27 spline carbon steel axle shafts have a nasty habit of snapping when a locker is installed, especially with a tire as large & heavy as a 33" is. So I would lock the front axle but until the rear Dana 35 can be upgraded with stronger alloy axle shafts or be replaced entirely, I would not lock it.
Lunchbox lockers work well in the front, in fact they work a lot better in the front than they do in the rear where they are not well behaved. In 2wd on the street, a lunchbox locker is well behaved & on the trail in 4x4, they are awesome.
The three lunchbox lockers I have personal experience with that I can recommend for your front Dana 30 include the No-Slip, Aussie, or Lockright. The one lunchbox locker I would avoid is the Detroit EZ-Locker which is not as well behaved as the others.