Question about 1998 Chevrolet K2500

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I have a 1999 1500 Suburban. The 4WD seems to have locked on. When I press 2WD, the light flashes several times, and then goes to 4WD. When I press AWD, the light stays on, but the 4WD seems to be still engages. The truck's front end makes a scraping sound while in 4WD, and I need to disengage the 4WD before driving in into a shop. Is there a selenoid that is engaging the front drive that can be disconnected and retracted?

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  • mf50 Apr 09, 2011

    I need to know how to disengage the 4WD so I can drive the truck to a shop.

  • mf50 Apr 12, 2011

    thanks for the information.

    I tried the reverse and forward, and no go.

    I spoke to a transmission shop I use, and they recommended the same thing (works 9 out of 10 times for cases like mine), but to hold the button down while in reverse, stop, neurtal and hold it, then forward while holding the button, stop, neutral and hold it, and repeat several times. Didn't work.

    I will try the next step and let you know.

  • mf50 Apr 15, 2011

    I disconnected the linkage, and 4WD disengaged. Drove it in and transfer motor is gone, and required replacement. Motor was jammed tight, so the reason why the back and forth didn't work in this case.
    Thanks

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  • Chevrolet Master
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The 4 wheel drive tends to lock in and wont dissengage unless you put it in reverse then drive then put the 4wd on reverse then forward again then disengage and reverse one more time. ------------ Try disconnecting the actuator at the front diff and see whether it disengages quickly. The actuator moves a shift fork and gear sleeve in the front diff, once the actuator turns off a return spring disengages the shift fork and gear sleeve to return the truck to 2WD. Possibly the spring is bad/broken or the shift fork/sleeve are getting hung up? It can be encoder motor on the transfer case. Try hitting the transfer case with hammer slightly. You can try taking a small hammer and tap on the motor and sometimes it will free it up. If not, it's most likely going to need replacement.---------- This should help.Keep updated.Thanks.Helpmech.

Posted on Apr 09, 2011

  • raj somaiya Apr 12, 2011

    Yes keep updated with the detailed results.Thanks.Helpmech.

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  • Chevrolet Master
  • 17,970 Answers

I guess that is the transmission case motor switch is not sure what mode it is in (4x4low, 4x4high or 2wd)., and need to be replaced.

The advantage of Dorman actuator is that it is not the gas controlled piston which is cold temperature sensitive. There are tricks to install the transmission switch so I would not recommend doing it by yourself since you can seriously kill your transmission.

Good luck
.

Posted on Apr 09, 2011

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