GM Truck Club
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Results 1 to 6 of 6
  1. #1

    Default 88' Z71 4wd stopped working

    Hi there, my 4wd quit working on me the other day, and I can't seem to pinpoint what I need to get fixed. I checked the actuator, which seemed to be working fine going in and out, until I tried to compress it by hand, and it was pretty easy to do. I thought this wasn't normal, so I went out and bought a new one, only to plug it in and find little to no difference between the two. Without installing and trying the new one, I put the old one back in after trying to manually engage the 4wd myself.

    Having the front end up on jackstands, I pushed in on the plate that the actuator engages, and i could spin either front wheel with no problem, while the other wheel would spin slowly in the opposite direction.

    Without having the plate engaged, each wheel would spin freely and independently.

    Does it sound like the pinion is stripped behind that plate that engages the 4wd?

    I'm pretty mechanically inclined, but I have very little experience with transmissions and 4wd systems.

    Is there anything else I can try? I'd hate to have to take it to a mechanic if it is something I can do myself.

    Thanks a lot!!!! Any comments or suggestions will be greatly appreciated!

    Last edited by Jagerballs; 12-18-2008 at 08:48 PM. Reason: spelling

  2. #2


    bump .... anyone know?

    2002 Jeep Wrangler Sport 4x4 (the Yellow Jacket)
    4inch suspension 3inch body
    Straight 6 (383 Stroker within a year)
    36inch SuperSwamper TSL.
    Detroit Loccers
    Daily Driver Weekend Wheeler
    much more...

    2004 Sierra crew cab, 2wd, 5.3 V8
    2inch Daystar Leveling kit
    single dumped Flowmaster 40 sieries exaust(removed)
    Mb Blitz Chrome wheels
    Leer Bed Cover(for sale)
    50k miles

  3. #3
    Jr. Mechanic thatjerk01's Avatar
    Join Date
    Feb 2009
    currently arizona soon to be idaho


    can u hear the transfer case try and change to 4x4?
    Casey Clark
    Currently Arizona
    Soon Idaho
    1996 CHEVY K1500 Z71
    Front end collision
    145000 miles about

  4. #4

    Default 4x4 issue

    nope, doesn't make a sound...

  5. #5
    Jr. Mechanic thatjerk01's Avatar
    Join Date
    Feb 2009
    currently arizona soon to be idaho


    put all for tires in the air put the transmission in neutral the transfer case in 4x4 and spin the front axle and see what if the tires spin. the tranfer case takes a few thing as inputs to tell the transfer case to change in to 4x4. it could be the shift motor on the transfer case. it shifts it from 2 wheel to 4 wheel

  6. #6


    One thing to check that happen to me is if one of your passenger side half shaft is sticking out of the axle a little. mine had a small washer that came out of place at the end of the axle shaft which wouldn't let the 4wd engage.
    1989 GMC Sierra 1500 6" lift 35x12.5x15 bfg m/t, not on the road anymore but will be back soon!
    2005 Jeep Wrangler X, 31x10.50 bfg a/t, 15x8 soft 8's

Similar Threads

  1. Rearview Mirror Display stopped working?
    By bnlake in forum General Chevy & GM Tech Questions
    Replies: 2
    Last: 06-28-2010, 07:52 PM
  2. 4x4 stopped working
    By nvyseal11 in forum Lifted & Offroad Suspension
    Replies: 3
    Last: 11-29-2009, 07:02 PM
  3. Blower stopped working
    By engrsjp1 in forum General Chevy & GM Tech Questions
    Replies: 3
    Last: 09-25-2009, 02:00 PM
  4. 04 silverado temp/compass stopped working
    By drumm14 in forum Audio, Video & Gadget Tech
    Replies: 1
    Last: 05-26-2009, 05:24 PM
  5. '03 Silverado, cigarette lighter stopped working
    By gtilley45 in forum Audio, Video & Gadget Tech
    Replies: 9
    Last: 02-09-2009, 08:52 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts