One problem related to seat broken has been reported for the 1999 Chevrolet K1500. The most recently reported issues are listed below.
Vehicle vibrates at speeds of 60 to 70. General motors indicated that this was normal for this vehicle. Gm also indicated it would be 30 to 60 days before new springs and shocks could be designed for the front and rear. Vehicle vibrates and is hard to control on uneven surfaces. Also, the track on the drivers seat broke and the dealer indicated that there were no parts available to replace seat track at this time. The sevice manager indicated this was a problem when a new model hits the market. Seat was repaired by placing a wooden block under the seat until parts are available.