Bill 
2006 Nissan Titan King Cab SE FFV 4dr King Cab SB (5.6L 8cyl 5A)
Titan woes
 Vibration at 24 to 35 mph during acceleration or deceleration. Dealer balanced tires, no change in vibration. All dealer says is that the vehicle is drivable. Vibration does not seem to be related to engine rpm. In shop two times 1500 and 3000 miles. Dealer did not check driveshaft balance or carrier bearing on driveshaft. Only says could be tires. Tires show no abnormal wear. Tread depth across all treads 11/32. Sure would like to see dealer get enthused and find this aggravating problem.