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Actuator wanting to engage on its own transfer case

Tiny
GNOTTON
  • MEMBER
  • 1995 GMC SIERRA
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 223,000 MILES
When stopped at a light I go to give it the gas a little bit and the actuator wants to start engaging then it will stop. The truck goes good again, but every time I stop and go to start it wants to try engaging.
Tuesday, August 15th, 2017 AT 6:05 PM

11 Replies

Tiny
HARRY P
  • MECHANIC
  • 2,292 POSTS
Is this a push button 4x4 system? If so, the push button switches themselves short out sometimes and act like they have a mind of their own. Unhook the switch and see if it does better. Let us know.
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Tuesday, August 15th, 2017 AT 7:49 PM
Tiny
GNOTTON
  • MEMBER
  • 7 POSTS
No it is not push button shift on floor.
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Wednesday, August 16th, 2017 AT 1:30 PM
Tiny
GNOTTON
  • MEMBER
  • 7 POSTS
I have a floor shift.
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Wednesday, August 16th, 2017 AT 5:33 PM
Tiny
HARRY P
  • MECHANIC
  • 2,292 POSTS
Well it has been a long time since I did any work on one of those. If I remember correctly, the pin that holds the selector in place can get a little loose, causing the lever to easily slide back and forth. Try taking the rubber boot around the shifter off and checking and rechecking the tightness of everything.
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Wednesday, August 16th, 2017 AT 7:29 PM
Tiny
GNOTTON
  • MEMBER
  • 7 POSTS
Okay, thank you I will do that and get back to you.
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Wednesday, August 16th, 2017 AT 10:29 PM
Tiny
STEVE W.
  • MECHANIC
  • 13,573 POSTS
Do you mean the transfer case tries to engage or the front axle actuator?

To see if it is electrical or mechanical, pull the 4WD fuse (no 24 in the I/P box) That will cut power to the switch and front actuator. If the problem goes away it is either the switch on the top left of the T-case which is turning the front actuator on for a couple seconds.

Or the linkage is loose.
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Wednesday, August 16th, 2017 AT 10:29 PM
Tiny
GNOTTON
  • MEMBER
  • 7 POSTS
I am pretty sure the doors is coming from the transfer case it sounds like you are trying to shift the transmission without the clutch but only for a brief second while you are taking off from a complete stop. Or you go over speed bumps I hear it I took out fuse 24 and it still has the same problem. I really appreciate your help.
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Wednesday, August 16th, 2017 AT 10:45 PM
Tiny
STEVE W.
  • MECHANIC
  • 13,573 POSTS
Okay, mechanical it is.

Do you have any gravel roads or wet grass nearby? Something with low friction? If so get on that surface and shift into 4 high, see if you hear the same noise then.

Also check the U joints, a dry or stiff one can make noises and cause other parts to make noises as well.

Drive line noise can be a bear to trace. I have spent a lot of time tracking down noises with various tools. I use a chassis ear a lot. I have also have a few cheap digital recorders that I added clips on.
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Thursday, August 17th, 2017 AT 12:30 AM
Tiny
GNOTTON
  • MEMBER
  • 7 POSTS
Yes, have gravel roads used 4wh. And 4wl about a mile four wheel drive works good switch back to regular drive same problem clashing of gears noise when you first start off. U-joints check out okay.
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Thursday, August 17th, 2017 AT 4:57 PM
Tiny
STEVE W.
  • MECHANIC
  • 13,573 POSTS
Do you think you could record it and post it online so we can hear it?
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Thursday, August 17th, 2017 AT 5:35 PM
Tiny
GNOTTON
  • MEMBER
  • 7 POSTS
Enter reply. Ill do my best
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Thursday, August 17th, 2017 AT 8:37 PM

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