4x4 issue

ddraszt · 01-08-2008, 06:37 PM

99 gmc sierra 1500. k four wheel drive engages sometimes. In times that it won't the front driveline does spin. Have replaced the actuator. Typically it will engage then I will get a thunk and it kicks out. Anyone familiar with these diffs and how the actuator works mechanically into the diff or know of possible issues that could cause this. thanks.

stumpuller454 · 01-08-2008, 07:10 PM

is it a 4 buton "auto" 3 button or manual shift system?

o3shortbed · 01-08-2008, 07:42 PM

my wife has a 99 chevy with the push button 4wd and mine does the samething chevy told me the push button breaks and can engage at random. a new switch is redesigned and should fix it. cost alot so i just live with it

ddraszt · 01-09-2008, 06:04 PM

it is the push button style with auto four wheel. I really can't see myself having a nice lifted 2wd drive truck so I will pass on dealing with it.

jimbo543 · 01-17-2008, 01:35 AM

if it has high miles it could be the nub/pin broken on the end of the right axle, the engagement gear rides on it, if broken shaft wobbles causing erratic engagement

01-08-2008, 06:37 PM	#1
ddraszt Full Member Join Date: Jun 2007 Location: arlington wa Posts: 43	4x4 issue 99 gmc sierra 1500. k four wheel drive engages sometimes. In times that it won't the front driveline does spin. Have replaced the actuator. Typically it will engage then I will get a thunk and it kicks out. Anyone familiar with these diffs and how the actuator works mechanically into the diff or know of possible issues that could cause this. thanks. __________________ "It is what it is"

01-09-2008, 06:04 PM	#4
ddraszt Full Member Join Date: Jun 2007 Location: arlington wa Posts: 43	it is the push button style with auto four wheel. I really can't see myself having a nice lifted 2wd drive truck so I will pass on dealing with it. __________________ "It is what it is"

01-17-2008, 01:35 AM	#5
jimbo543 Senior Member Join Date: Sep 2007 Location: MN Posts: 205	if it has high miles it could be the nub/pin broken on the end of the right axle, the engagement gear rides on it, if broken shaft wobbles causing erratic engagement Last edited by jimbo543; 01-17-2008 at 01:36 AM. Reason: .

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01-08-2008, 07:10 PM	#2
stumpuller454 Senior Member Join Date: Dec 2007 Location: Grande Prairie, AB Posts: 2,043	is it a 4 buton "auto" 3 button or manual shift system?

01-08-2008, 07:42 PM	#3
o3shortbed Senior Member Join Date: Jan 2008 Location: L-burg KY Posts: 334	my wife has a 99 chevy with the push button 4wd and mine does the samething chevy told me the push button breaks and can engage at random. a new switch is redesigned and should fix it. cost alot so i just live with it