Question about 1997 GMC Sierra

2 Answers

I have a 1997 gmc suburban works fine in forard gears but will not move when shifted into reverse

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  • gjbpaul Mar 20, 2011

    the truck has 200,000 miles so i agree probably not worth the rebuild do you have a gmc part number for that vacumm line should i need to replace

  • gjbpaul Mar 20, 2011

    how do i know wheteher it is a 4000 sreies transmission

  • gjbpaul Mar 20, 2011


  • gjbpaul Mar 21, 2011

    should i not check the vaccum line or is that not effect the reverse on an automatic transmission


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I see you have been given advise on the initial issue.
I agree it will need to be overhauled or replaced.
You are now searching for identification.
Ok, here is a transmission pan identification pattern. This is the easiest way.

i have a 1997 gmc - kiltylake_232.gif

If you would like further asistance, please ask me here.
Thank you for using fixYa.

Posted on Mar 20, 2011

  • FUBAR Mar 21, 2011

    Hello Gib.

    Unfortunately, no, it does not.
    The vacuum line affects shift points but not whether the transmission engages into reverse.
    The problem is internal and is common for failure.
    I do not overhaul transmissions in my shop. But we do diagnostics and then send them to a trans shop for repairs.
    It may be worth your while to have it repaired rather than replace with a used unit. Unless you know for sure that the replacement is a good one.



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If your truck is somewhat original and there is no vacuum line it either has the line missing or it has a 400 turbo trand in it. If the line is missing it should have been hooked to a modulator on the rear of the trans passenger side about 5 to 10 inches from the very back depending on the tail shaft housing, The other end should hook to direct manifold vacuum.

It would have a electric detent with one wire going to it on the drivers side of the trans about in the middle.
If the wire or vacuum hose is in good order, you may need to rebuild the trans, Any repair labor would be too much to justify the cost sinse the entire rebuild kit including a rebuilt torque converter.

keep us updated.

Posted on Mar 20, 2011

  • ZJ Limited
    ZJ Limited Mar 20, 2011

    MAP sensor to carburetor vacumm line if cracked or broken will cause Tranny problems and additional idle problems.

    The vacuum modulator does control the firmness of the shifts but it should not allow it to slip. No vacuum signal because of damaged or non connected lines would make the transmission think you were at full throttle all the time and in theory firm up the shifts. A full vacuum signal all the time would give you softer shifts.

    Check this links to find specifi parts:


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