Question about 1999 Chevrolet Blazer

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Transmission wont shift from first untill over 3000 rpm

It was fine untill engine overheated (several times) due to blown head gasket. I tried the Head gasket seal repair in a bottle. followed directions to the T. Backflushing the system and refilling as needed. Weather was cold (12 degrees F) but kept garage warm during drying for 12 hrs. once system was refilled I warmed up engine at idle then drove. It immediatly overheated and wouldnt get out of first gear. going into gear was with a jult not smooth. I rebuilt the engine but the transmission problem is still there...Can I save her?

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One often omitted and forgotten fact: Your transmission is cooled by the radiator. During an overheat condition radiator temp increases, causing overheating of trans fluid. I would drain and re-fill transmission (also check to see if converter has a drain plug...some do) and blow out trans cooler lines to ensure there is no blockage inside radiator/trans cooling portion. Use a good quality trans conditioner (I use Lucas, but there are others out there that probably work as well) along with new oil. If trans oil has overheated and formed any gummy deposits, this can prevent valve body from working correctly. This is your best chance to restore operation. If it dosent work, and you do not have any control wires disconnected anywhere, you likely will need a rebuild!
good luck

Posted on Feb 15, 2009

  • Richard Scordino Feb 15, 2009

    One often omitted and forgotten fact: Your transmission is cooled by the radiator. During an overheat condition radiator temp increases, causing overheating of trans fluid. I would drain and re-fill transmission (also check to see if converter has a drain plug...some do) and blow out trans cooler lines to ensure there is no blockage inside radiator/trans cooling portion. Use a good quality trans conditioner (I use Lucas, but there are others out there that probably work as well) along with new oil. If trans oil has overheated and formed any gummy deposits, this can prevent valve body from working correctly. This is your best chance to restore operation. If it dosent work, and you do not have any control wires disconnected anywhere, you likely will need a rebuild!
    good luck

  • Richard Scordino Feb 15, 2009

    One often omitted and forgotten fact: Your transmission is cooled by the radiator. During an overheat condition radiator temp increases, causing overheating of trans fluid. I would drain and re-fill transmission (also check to see if converter has a drain plug...some do) and blow out trans cooler lines to ensure there is no blockage inside radiator/trans cooling portion. Use a good quality trans conditioner (I use Lucas, but there are others out there that probably work as well) along with new oil. If trans oil has overheated and formed any gummy deposits, this can prevent valve body from working correctly. This is your best chance to restore operation. If it dosent work, and you do not have any control wires disconnected anywhere, you likely will need a rebuild!
    good luck

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