The transmission failed to hold the car back at all on my snow covered driveway descending a hill. Resulted in car gaining speed very quickly and when brakes were applied car slid into a tree. Hit on right front wheel side and destroyed everything. A 5 to 10 mph crash did $10000.00 damage. If anyone has this model Acadia dont trust your manual drive to hold you back going downhill. If anyone else has had this problem please post it here.. Thanks