MY opinion would be not to buy the kit.
They will charge by the hour 70-100 + the cost of the kit you buy...
also, why are you buying a new drive shaft? is there a reason behind it? is it aluminum? .. seems like your money could be better spent.
Look into buying new shocks and struts and springs, lower control arms. remove your quad shocks and take a look at your rotors and pads... I bet that rite there would not only eliminate a lot of the squeaks but would be money better spent.
I assume if they are replacing the bushings they may come back to you and tell you parts that will need to be replaced and not just the bushings...