Question about GMC Sierra 2500

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I have a 1989 GMC seirra 2500 ext. cab 4x4 with a 350 motor in it. the problem I have is that the trani wont shift gears while in drive. So maybe you can help me out with your expert advice.

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If you can shift the transmission manually,by moving the shifter from d1 on up,then it is most likely the governor has trash in it,and would have to be removed and cleaned,or the valve body in the transmission is not working,the valves are stuck,I would try a synthetic additive called Lube Guard,it treats the valve body,and allows the valves to move freely.

Posted on Jul 21, 2010

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Posted on Jan 02, 2017

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