Thanks to SK.

http://www.monroetruck.com/whatshappening.asp

* Conversion available with diesel or gas engines, manual or automatic transmissions
* Available in all GVWRs offered by GM
* In-cab air switches with dash lights for front axle engage and high/low shifting
* Carraro axle capable of being rated up to 8000#
* Offset differential bowl to minimize frame height
* Double-carden joints in axle provide 40 degree turn angle
* Factory steering gear,progressive load damper and ABS maintained
* 4WD available with all factory fuel tank options
* Initial production is available in 5.13:1 axle ratio
* Heavy-duty 2-speed Isuzu transfer case
* 2.09 low gear ratio; 1:1 high gear ratio
* Equipped with oil pump and oil cooler
* Front axle de-clutch