1998 GMC Truck shifting problems

1998 GMC TRUCK
235,000 MILES • V8 • 4WD • AUTOMATIC
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SHEILARAE
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  • 1 POST
truck shifts ok when cold. When warmed up it will not go into overdrive or gear one. I have already changed the electrical harness and it is not the ignition switch, what else should I be checking :(
Oct 19, 2010 at 6:29 AM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
take it toa trans shopwhere they can scan it to seeif any codes are set. It could be somethingelectricalor the trans bad itself.
Nov 2, 2010 at 3:09 PM
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