One problem related to automatic transmission torque converter has been reported for the 1999 Chevrolet Silverado. The most recently reported issues are listed below.
I own a 1999 Chevrolet Silverado 4x4 ext. Cab with a 5. 3 engine and have had, what seems to me, to be a strong vibration coming from the torque converter at 40-50 mph. Dealer tells me they can't find any vibration even though the mechanics can feel it when driving it. Also the rear leaf springs clunk going over even the smallest of bumps. Both have happened ever since I purchased the vehicle.