Question about 1994 GMC Suburban

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I have a 1994 GMC 2500. Recently on a cold morning it would not shift out of first gear. After about 30 minutes of warm up it started shifting normal. After replacing the filter which was very dirty and seemed cloged it did the same thing. I added a pint of Trans Tune and it is still taking a 30 minute warm up before it will start shifting out of first. After that it shifts normal.

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It sounds like that you have a valve in the valve body, located above the filter, that is sticking due to some of the debris not caught by the clogged filter. If the trans tune does not get it then you will have to remove the valve body then remove the valves manually and clean them. Recomend that you have a professional do it due to the complex nature.

Posted on Mar 03, 2009

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