A few weeks ago I had the ARB Twin Compressor and ARB Air Locker installed in the rear D44. I also had a Eaton Truetrac LSD installed in the front D30. This was all done as part of re-gear. I am now running 4.88 gears. What an improvement over the 3.73's with the 35's! Lastly, I also had chromoly shafts installed in the rear.
My shop fabricated a bracket for the compressor and to relocate the cruise control actuator.
I also got the tire inflation kit. I love it! So much faster than my old pump.