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4wheel drive won't work?

Discussion in '1992-Present Chevy & GMC models' started by lgk5, Nov 28, 2004.

  1. lgk5

    lgk5 1/2 ton status

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    4wheel drive won\'t work?

    you can shift it into 4x4 the drive shaft turns
    but not the wheeels?????
    any help would be great, /forums/images/graemlins/truck.gif 88 1500 ifs /forums/images/graemlins/truck.gif
     
  2. divorced

    divorced 3/4 ton status

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    Re: 4wheel drive won\'t work?

    Probably the actuator in the front differential.
     
  3. Pookster

    Pookster 1/2 ton status

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    Re: 4wheel drive won\'t work?

    IIRC, the older ones had a lot to be desired in their operation. Most owners changed them to a manual acutator, such as the 4x4 posi lock. (Jeep guys deal with that crap too). It replaces the problomatic vacuum or thermal system with an in cab control.

    IIRC, the drive shafts always turn.
     
  4. thezentree

    thezentree 3/4 ton status

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    Re: 4wheel drive won\'t work?

    the front shaft shouldn't turn unless its in 4wd. my guess would be a bad actuator as well, unless by "the front wheels arent turning" you mean theyre seized up solid, in which case you may want to just shoot it and put it out of its misery. /forums/images/graemlins/dunno.gif
     
  5. K5MONSTERCHEV

    K5MONSTERCHEV 1/2 ton status

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    Re: 4wheel drive won\'t work?

    Put it in 4wd and either touch the actuator (it should get hot), or take it out and see if it works.
     
  6. HarryH3

    HarryH3 1 ton status Author

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    Re: 4wheel drive won\'t work?

    The early IFS trucks have an actuator that engages when an electrical heater inside causes a gas to expand. This pushes out on the shaft and engages the front diff. When they get old (and some of the gas has leaked out) then they don't work well, especially when it's cold outside. /forums/images/graemlins/frown.gif GM sells a replacement that uses an electrical motor instead of the heated gas. IIRC, it's around $100, if you can get the "good buddy" price at the parts counter.
     
  7. Emmettology 101

    Emmettology 101 3/4 ton status

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    Re: 4wheel drive won\'t work?

    Just to add a little to this...(and a good parts counter guy should know) If you get the new style electric motor actuator, you also need to get a little wiring harness to go with the new style motor.
     
  8. HarryH3

    HarryH3 1 ton status Author

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    Re: 4wheel drive won\'t work?

    The ~ $100 price tag includes the pigtail that you need to buy to plug it all together. :thumb:
     
  9. Emmettology 101

    Emmettology 101 3/4 ton status

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    Re: 4wheel drive won\'t work?


    It's been a while, but I think mine came seperately.. :( But either way, I have a friend that works at the delaership and I didn't pay anything close to retail.. :thumb:
     
  10. HarryH3

    HarryH3 1 ton status Author

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    Yep, it comes as 2 different part numbers, in 2 different packages. As I recall, it's about $140 retail for both. My price at a local shop is around $100. You only need the pigtail the first time. If you have to replace the motor later, you can buy just the motor. :cool:

    It just pisses me off that GM screws people to replace a part that wasn't thought out very well in the design phase! :mad:
     
  11. BigBen

    BigBen 1/2 ton status Premium Member

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    How bad to change the actuator?

    I've been thinking about doing this same switch on my '95 Yukon to get better engagement. (I hate the suspense of sitting in a snowstorm and waiting for *blink* *blink* *blink* *blink*................engaged)

    It doesn't look like the actuator would be that hard to change on the truck when I look in the manual.

    Any guess as to how long of a job it really is? Anything tricky we should know about before-hand?......


    THANKS!!

    -Ben
     
  12. divorced

    divorced 3/4 ton status

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    It's not a difficult job at all. You just unscrew the old actuator from the differential and screw the new one in and unhook the old wiring harness and hook up the new one.


    Has anyone ever tried the cable type manual actuators?



    .
     
  13. BigBen

    BigBen 1/2 ton status Premium Member

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    Ok,

    I'll give it a shot once things thaw out here in Michigan.

    Thanks,

    -Ben
     
  14. AkMudr

    AkMudr 1/2 ton status

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    Took me all of 5 minutes when I did it on my '91. No harder than pullin spark plugs.
     
  15. andrew.wilson

    andrew.wilson Registered Member

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    That can be very difficult for some people :D ( the pulling spark plug thing) i.e. my neighbor
     
  16. bigred81

    bigred81 1/2 ton status

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    If the actuator does not fix it I have come across a lot of the early half tons that broke the passenger side axle shaft inside the front diff.

    bigred81
     
  17. andrew.wilson

    andrew.wilson Registered Member

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    That happend to me on my 93 Z71 but it was due to abuse (and about 6 feet of air) I broke alot of other things along with it though.
     

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