Yeah but the 4x4 kit is not a tru-trac and I don't beleive the $600 comes with the master install kit, Which you really should get for both the front and rear.

 

i got mine done at a local offroad shop. they pushed precision gear but i wanted yukon. i payed more but i got what i wanted and they threw in free new axle seals(i bet they goofed up along the way) and a free lube change after the 500 mile mark. of course i have to buy the royal purple. but im ready to get out of this damn break in period and let her rip. DTT and gears, and install ran me about 1950