1996 GMC Sierra Logo
Posted on Apr 28, 2009
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Transmission problem and backfiring

I have a 1996 GMC Sierra 1500 350 5.7 Vortech. I just changed the transmission fluid and filter on it and now it won't shift past 2nd gear, I double checked and it has the correct fluid in it and it ran fine before this. Also now I am having a backfire I changed the spark plugs today and it is no better. Also I noticed today that there’s a light ticking sound coming from what sounds like the transmission, it is not coming from the motor I have checked the oil and listened to it several times. I would greatly appreciate any help you can give me. Thanks.

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  • Marvin
    Marvin May 11, 2010

    suggest u use Fixya's Live Chat option for a detasiled answer to this problem.

  • Anonymous Jan 29, 2012

    These trucks have whats called a lock out trans. in them. this is a very common problem with them. Do to a bad speed sensor or bad dash cluster. One way to check the speed sensor is to simply unplug the plug located near the rear of the trans. if that doesnt help I would take it to someone that could run a diagnostic check on the cluster. I know that sounds bad. But these things can get expensive quick. 9 out of 10 times its the speed sensor. I hope this helps you and good luck.

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  • Posted on Apr 28, 2009
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YOu probably didn't get the filter in all the way.

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I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514

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