Four problems related to manual transmission have been reported for the 1999 Chevrolet Silverado. The most recently reported issues are listed below.
Consumer has had seatbelt repaired under a manufacturer's recall. But, consumer is calling to report that safety belts lock up at all times. Dealer has been contacted. The locking up of the seat belt severely restricts the drivers movement, the lock up problem makes it difficult to steer the vehicle and makes it impossible to reach the trailer-brake controller unit, at times the vehicle will not back up, possible transmission malfunction. Consumer can not get the retractor mechanism to release. Nlm.
The transmission does not function properly when towing on a steep grade, engine oscillates rapidly.
When the vehicle sits overnight the transmission whines for a few blocks, the tack does not show unusually high rpms.
Consumer states vehicle has stalled 3 times within the last 18 months for no reason, the vehicle stops pulling as if the transmission has lost its power train. (idc consulting, leonard philandez on behalf of consumer).