Question about 2003 GMC Sierra 2500HD
Tranny will hang in third on the way up or hang in third down shifting? whays going on?
This is most likely the torque converter lockup solenoid. It is inside the transmission.
Posted on Nov 27, 2013
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Posted on Jan 02, 2017
This trans is computer controled if your gages quit working as well I would start checking fuses and relays. If this doesn't provide a solution let me know and I will get my manual out and go a little deeper.
Posted on May 01, 2009
its a modulator hose its a small 5inch by 5 inch or so mod that is hooked to the trans being 4by4 has its advantages look you should be able to find it easy
Posted on Jun 06, 2009
96 gm trucks had a proble with third gear burning out because of a ground issue from pcm..there was a bulletin for adding a new ground for third gear control circuit...aftermarket trans shops do not remember this problem and it is often overlooked..take to local dealership and you should be able to get problem resolved
Posted on Dec 27, 2009
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