Four wheel drive actuator slow to engage

Discussion in 'Transfer Cases' started by 98chevy2500SS, Jul 29, 2020.

  1. df2x4

    df2x4 Domestics only.

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    Depends on how cold it is outside, but anywhere from 10 to 30 seconds I'd guess.
     
  2. alpinecrick

    alpinecrick I'm Awesome

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    My electric ones MIGHT take a second or two if it's really cold out, otherwise practically instantaneous.
     
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  3. alpinecrick

    alpinecrick I'm Awesome

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    This^^......
     
  4. df2x4

    df2x4 Domestics only.

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    This was definitely the case for mine. There was about eight inches of snow on the ground and I had just hopped in the truck to go somewhere. :lol: I can't be too upset at it though, that original thermal actuator lasted over 20 years.
     
  5. alpinecrick

    alpinecrick I'm Awesome

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    That's impressive. In 275K miles on my 91 Light K2500 I'm pretty sure I replaced mine 3 times.
    The 96 K1500 went out at least twice in 200k miles. I didn't wait for my 97, it had a 135k when I bought it, had the thermal still in it, but I installed an electric one first thing......
     
  6. alpinecrick

    alpinecrick I'm Awesome

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    As an added note, if either actuator is taking a long time to engage, a guy may want to change out to fresh front diff fluid.

    GM, in an attempt to address thermal actuators burning out, had a bulletin recommending synthetic fluid be installed in the front diff. My 01 Sierra's manual specs synthetic fluid in the front, conventional in the rear. I initially couldn't figure why, thinking it was possibly a different design in the front diff. But the GM parts guy said the synthetic fluid bulletin/specs were because of the actuator burning up in cold weather because of multiple attempts of the thermal actuator to engage.
     
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  7. 98chevy2500SS

    98chevy2500SS Specializes in Accessories 101

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    Ah ok, so mine must be fine then. I hear the actuator sound right when I push the button, but the light flashes for about 8 seconds.
     
  8. df2x4

    df2x4 Domestics only.

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    Yeah, that sounds pretty normal to me.
     
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  9. 98chevy2500SS

    98chevy2500SS Specializes in Accessories 101

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    I should probably change my diff fluids just for the hell of it before the cold weather rears it's ugly head again, I'm sure they are past due for a fluid change.
     
  10. Blazer92

    Blazer92 Newbie

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