2000 GMC Yukon

In the past two years have put about $6000 into vehicle not counting two new tires on front with 300 miles on them. Just got out of shop after putting in a new transfer case and motor. Replaced CV shafts also. Last April did a front end rework for $2100. See attached invoices.

Yukon has a lift kit and scooped hood. Just got it back from shop and there is a noise from rear end. I can still drive it anywhere but put enough into it already. Does not use oil. Change every 5000 miles with synthetic.