Question about 2003 GMC Sierra 1500
I assume it is and auto, if so firstly check auto trans oil level as per manufacturers instructions.
If all OK will need to take it to Auto trans specialist as I suspect removal / overhaul is required.
(NB = Get written quote before proceding as this job may be expensive)
Posted on Dec 10, 2009
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Posted on Jan 02, 2017
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