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Four wheel drive?

Discussion in 'Chevy Trucks' started by milwaukeevtwin, Dec 9, 2009.

  1. milwaukeevtwin

    milwaukeevtwin Senior Member
    Messages: 335

    1989 GMC 2500 When it put it in four wheel drive it acts like the front tires are not working? The rear just spin and i get no traction out of the front. When i put it in low the tranny just gears down. Same thing. It does not even grab when you turn a corner. Transfer case? Any ideals?
     
  2. Duncan90si

    Duncan90si Senior Member
    Messages: 602

    Check the 4WD fuse. It could also be the thermal switch thats on the front diff.
     
  3. milwaukeevtwin

    milwaukeevtwin Senior Member
    Messages: 335

    I hope it is the fuse. I WILL TRY LATER.THANKS
     
  4. 2COR517

    2COR517 PlowSite Fanatic
    Messages: 7,115

  5. JohnnyU

    JohnnyU 2000 Club Member
    Messages: 2,040

    My actuator died on me in the middle of a blizzard three years ago. Thanks to a very knowledgable and experienced mechanic out of Michigan, I was back on the road 10 minutes later. His solution was to install a regular lug nut (about 1" long) before the actuator. Basically, since the actuator didn't work, this would lock the axle so that I would still have 4wd. It is similar in principle to leaving your external lock-out hubs locked in and just shifting the transfer case.

    The real fix was when I cut all the IFS garbage out and installed a high-pinion Dana 60. :nod:
     
  6. 2COR517

    2COR517 PlowSite Fanatic
    Messages: 7,115

    I actually did some "creative repairs" on mine last nine. I used a 7/8 socket. Fit perfectly.
     
  7. JCI Trans

    JCI Trans Senior Member
    Messages: 313

    Its a very common problem, as stated above the best fix is the 4x4 posilock.
     
  8. tuna

    tuna Senior Member
    Messages: 488

    I`ve done the lugnut trick a few times works great,BTW I left it that way for 4 years no problem.
     
  9. milwaukeevtwin

    milwaukeevtwin Senior Member
    Messages: 335

    truck

    Well it was not the fuse. Thanks, For the help guys.
     
  10. JohnnyU

    JohnnyU 2000 Club Member
    Messages: 2,040

    It's seldom if ever the fuse. It's either the actuator, as I've already described, or the switch on the transfer case itself. I'm willing to bet its the actuator.


    To test this, unscrew it from the axle housing, engage the 4wd and wait to see if it extends. This may take a minute ot two as it is thermally driven. If this does not work, check to make sure that you receive 12V at the actuator plug. If you see 12V, then the actuator is bad. If you don't see 12V, then the switch at the tcase or wiring in between is at fault.
     
  11. milwaukeevtwin

    milwaukeevtwin Senior Member
    Messages: 335

    truck

    Well i took it to the trans shop. I just do not have time. We are still playing catch up with that truck down. Thanks for all the help. We will see what he says.
    Thanks, Ron
     
  12. JohnnyU

    JohnnyU 2000 Club Member
    Messages: 2,040

    Where are you located Ron? If you were close I would have gladly looked at it for you, but you're probably up around Chicago.
     
  13. milwaukeevtwin

    milwaukeevtwin Senior Member
    Messages: 335

    I really appreciate that. I live in South Beloit.This is my first year plowing for my self and i have had all kinds of problems. Oh well that is part of the business.
    Thanks, Ron
     
  14. CAT 245ME

    CAT 245ME PlowSite.com Addict
    Messages: 1,032

    Does any one know what is the life span of these actuators? Are they all the same for 88-98 trucks?
     
  15. JohnnyU

    JohnnyU 2000 Club Member
    Messages: 2,040

    The lifespan is indeterminable, but can be anything from a couple years to a couple decades.

    There was a change in 96-ish era when GM upgraded to a fully electric unit. Posi-lock is available for a similar price to doing to upgrade on an older truck.
     
  16. bad93blaster

    bad93blaster Member
    Messages: 62

    those work i have one in my old 1ton. i was blowing actuators on the 2nd 3rd time putting in 4 wheel drive ( cheaper for posi-lok then tring to figure it out)


    i have also used a cut down 1/4" bolt in the middle of the night
     
  17. M.S.P.M.

    M.S.P.M. Senior Member
    Messages: 107

    I have a similar problem but my 4 wheel drive wont engage at all. Its a 98 and it has the electronic push button system. It was just working this morning. Any help would be greatly apprecaited?
     
  18. 2COR517

    2COR517 PlowSite Fanatic
    Messages: 7,115

    Can you still hear the transfer case shifting?
     
  19. Duncan90si

    Duncan90si Senior Member
    Messages: 602

    Along with what he said, try putting it in low range. Does it go into low range and is still in 2WD? Or does it do nothing?
     
  20. M.S.P.M.

    M.S.P.M. Senior Member
    Messages: 107

    I can hear a clicking i dont think its the transfer case. Since its electronic I was thinking mabye a selanoid. But I tried low range and that did not work either.