Question about 2003 GMC Sierra 1500
Can't find my old trans diagrams but I don't remember there being any external or " reachable" internal adjustments on 350 units. From what you noted in your post, its more than likely that the unit has internal pressure problems and needs to be rebuilt. If you already have the filter off, replace it and refill the unit. If it does not move, then you definitely need a rebuild. if there was a lot of debris in the pan and oil smells really bad, don't even bother with filter.
Sorry I can't give you better news, but it is what it is.
Posted on Sep 23, 2009
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Posted on Jan 02, 2017
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