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IFS 4WD actuator

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Leadfoot, Feb 26, 2001.

  1. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    Has anyone replaced the actuator on a mid to late 90's Chevy 1/2 ton pick-up. The light on the transfer case plate lights up in 4 hi and 4 low, the front driveshaft spins, but the front wheels do not move under power. I was told it is probably the actuator. I was wondering how hard it is to remove and replace and if that sounds like the correct thing that is wrong.
    Thanks in advance for any help.
     
  2. dyeager535

    dyeager535 1 ton status Premium Member

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    Leadfoot, depending on your vehicle, that could be a warranty replace item. For awhile, they were using some kind of actuator that locked the hubs by heating up and expanding. About the stupidest thing they could do, because in cold weather, or fording, the thing got cold, and instant 2wd.

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
     
  3. 85blaze

    85blaze 1/2 ton status

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    Its about a 20 minute job with all the parts.. But you have to run a new wire to the transfer case. THey make an electric actuator now instead of the old vacume style. I cant help out with details, A buddys truck broke down and he said its real easy... it kinda screws in with a couple hold down bolts if i remember right? Correct me if im wrong.

    Later
    Moshe


    Finally done after 8 months.. Not really.. IM never going to be done. Stroker motor is next
     
  4. schwinnd

    schwinnd 1/2 ton status

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    I just replaced the vacuum actuator switch on my wife's 97 S10 Blazer. When you push the button on the dash it sends a signal to open a vacuum line, which sucks a diaphram, which in turn pull a cable engaging the front diff. It was pretty easy. The switch sits on top of the transfer case. I had to drop the skid plate to get to the t-case, and its on the driverside rear of the t-case. Pop off the vacuum lines unscrew it and screw the new one in, put the vac. lines back on, bolt up the skid plate and thats it. I'm not sure if its the same as a full size p/u, just figured they may be similar. Good luck

    Just collecting rusty mid-70's chevy's
    1976 Blazer, 1975 Vega SW
     
  5. schwinnd

    schwinnd 1/2 ton status

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    BTW the vacuum actuator switch was only $25.28 at the chevy dealership.

    Just collecting rusty mid-70's chevy's
    1976 Blazer, 1975 Vega SW
     
  6. AJMBLAZER

    AJMBLAZER Better to be lucky than good. Premium Member

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    Go to the Standard Chevy/GMC trucks forum on <A target="_blank" HREF=http://www.off-road.com/chevy>http://www.off-road.com/chevy</A>, and take a look there. There are like 2 or 3 posts about this exact same subject from the last couple of days.

    1992 Blazer Sport, 350 TBI, 4L60, 3" Flowmaster, K&N, 3" Rancho, 285/75R16 on 16x8 Baja's[​IMG]
     

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