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1999 GMC Sierra 2500 HD SL 2dr Regular Cab LB HD SL 3dr Extended Cab 4WD SB
ABS electronic module - replaced by dealer in Virgina only problem. Drove 300 miles to pick up - has one of first 6.0 liter engines. Great power. Engine does not show up as option in parts stores until 2001.
1999 GMC Sierra 2500 HD SL 2dr Regular Cab LB SLT 3dr Extended Cab SB
4WD light comes on intermittently lately. Poor troubleshooting procedures from a Chilton manual led me to replace the front diff actuator motor. Seems the real culprit is a sticky selector switch. Humidity may be affecting this switch, apparently the resistors are shot for each position and loses ability to keep voltage signal to transfer case module. Original battery lasted 6 years so that was awesome to get over 6 years from a battery. Also developed a leak at the front differential. First thought it was the output seal but ended up being the plastic vent cap that screws into the diff.
4 wheel disc brakes, 6.0L engine, tow/haul feature, large console, overhead console, more room in extended cab with new body style 3rd door
More durable 4WD switch, better vent design for front diff,