Question about 2003 GMC Sonoma Extended Cab

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Shifting issues I have a 2003 sonoma 4door short bed 4x4 that shifts fine until you get it up to about 50 mph. then it up shift and down shifts all the time I took it in and the shop said it had burnt oil and i needed anew transmission. i am not sure its true and I dont know what type tranny too look for it has the 4.3 vortex 6 clydr thanks for your help

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I would trying changing the fluid in it before you go through all that. I would probably put a quart of lucas in it with the fresh oil. If you have to have a transmission, when you call the salvage yard just tell them what truck you have. they are usually pretty good about giving you the right stuff. specially with transmissions and engines.

Posted on Jun 27, 2009

  • Brandon Stephens
    Brandon Stephens Aug 24, 2013

    I had/have the same problem. I recently swapped my Sonoma tranny out for a used one & now this used tranny is going out too. Never thought i'd say this but either buy a new tranny not used or get another truck.

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