When making slow turns ie: parking, vehicle makes loud groaning noise from rear of vehicle
The fluid in the versa trak AWD in the rear is old and needs to be drained and refilled. After you drain and refill it, make a bunch of sharp left and right hand turns, then drive it for 10 minutes. Drain and refill it for the second time and problem solved. Use only versa trak fluid available at any GM dealership. There is TSB on this now at the Buick dealership.
Check your rear brakes and wheel bearings
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