Question about 2003 GMC Sierra 1500

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79' GMC sierra grande-Transmision. will go in reverse but not 1st 2nd or third! i know its a 350 twin turbo. ive been told to replce my trans filter and modulater. ive also heard it could be my band ajustment. i pulled off my trans filter. Dont Know how do i fix o replace my band ajustments?

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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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