Yes , when i tried it for the first time , had worn bgd m/t's on the truck with no air bags,hooked to a national sled, got 2 nd place , lost by 3 feet, but with a stock rear suspension i lost alot of hitch hight, the next time i pulled, i had the same worn bfg m/t's and had air bags at 50 lbs and it bounced form the rear a little bit , this time i put new nitto tires on it , put the airbags at 90 lbs and when i left the line i was fine , i got about 60 feet into and it started bouncing in the rear of the truck bad, the most its ever done , the front is fine,no bouce or anything , i think this week end with new bars on, i ll put the rear tires down to 45 lbs and put air bags at 35 lbs and try that ?