Please Help!!! Problems engaging 4WD

sierra 4x4 · 06-17-2005, 08:01 PM

I have a 95 GMC Sierra 2500 4x4, and it will not engage the front wheels...I am guessing that the auto hubs are not locking. I checked the fuse, and it was blown, so I replaced it, and it blew the new fuse also. If anyone know what the problem is and/or how to fix it please let me know.

Thanks.

Ford4x4Chik27 · 06-17-2005, 11:51 PM

Crossed wires? It sounds to me like you have a short somewhere...the trick is finding it

marble75 · 06-18-2005, 10:03 AM

mabye the acuator motor has a short thats the motor that locks the 4wheel drive i think u might check this and also there are several harneses on the trany that are conected to this . u might start there

Ozymandias · 08-20-2005, 07:21 PM

I can tell you what it is... there is an actuator motor in the front Dif... this thing goes out on a whim.. you can pick up a new one from autozone for like $125 if i remember correctly... however if you do this you're self, there is a new extra wire on the new one, this replaces the temp sensor that was on the factory actuator. ; )

67redbowtie · 08-26-2005, 10:51 PM

try looking on the side of the front diff.You should have an acuator there w/a wire harness conected to it, I had the same proplem on mine and if you dont use your 4 wheel drive often it will lock in and not engage, what I did was take mine out and pull out the acuator with channel locks while a friend ennergized it in the cab repeated several times untill it was free. After that I will every now n then I will shift into 4 wheel drive even at a stop to keep it in action..........

Kennyray · 10-07-2005, 04:19 PM

On my 95 serria it was the switch on the tranfer case. According to a mech friend of mine they changed the actuator in 96 and started having problems then, so he put a 95 actuator on his 96. Just my 2 cents.

chevyguy · 10-07-2005, 10:21 PM

O.K. here we go. Sinple unplug the fron diff actuator and engange the 4 wheel drive (press the button) if it blows the fuse still it is the actuator, if not plug the actuator in and unplug the transfer case and try it again. These are simple chacks to verify which component is bad. Otherwise your just playing parts changing roulette.

Itstali25 · 10-09-2005, 04:18 PM

lol parts changing roulette..........sorry i thought that was funny, i've never heard it before lol

chevyguy · 10-09-2005, 11:27 PM

Alot of people do it when they dont properly diagnose the problem and end up replacing alot of good parts

06-17-2005, 08:01 PM	#1
sierra 4x4 Junior Member Join Date: Jun 2005 Posts: 1	Please Help!!! Problems engaging 4WD I have a 95 GMC Sierra 2500 4x4, and it will not engage the front wheels...I am guessing that the auto hubs are not locking. I checked the fuse, and it was blown, so I replaced it, and it blew the new fuse also. If anyone know what the problem is and/or how to fix it please let me know. Thanks.

06-17-2005, 11:51 PM	#2
Ford4x4Chik27 Senior Member Join Date: Sep 2004 Location: Sac-Town, Cali Posts: 1,585	Crossed wires? It sounds to me like you have a short somewhere...the trick is finding it __________________ '93 Isuzu Amigo, Toyota Axles/Tcase/Drivelines, 35" MTR's '01 Pathfinder, making a huge effort to keep it stock, since it's my DD

10-07-2005, 10:21 PM	#7
chevyguy Senior Member Join Date: Sep 2005 Location: ALABAMA Posts: 3,370	O.K. here we go. Sinple unplug the fron diff actuator and engange the 4 wheel drive (press the button) if it blows the fuse still it is the actuator, if not plug the actuator in and unplug the transfer case and try it again. These are simple chacks to verify which component is bad. Otherwise your just playing parts changing roulette. __________________ Friends dont let friends use body lifts USMC 92-96 USCG 98 to present

10-09-2005, 04:18 PM	#8
Itstali25 Senior Member Join Date: Jul 2004 Location: Southern Missouri Posts: 708	lol parts changing roulette..........sorry i thought that was funny, i've never heard it before lol __________________ http://www.cardomain.com/ride/644045 Trucks are just cars when they grow up!!! If your gunna get a truck....Get a TRUCK!!

10-09-2005, 11:27 PM	#9
chevyguy Senior Member Join Date: Sep 2005 Location: ALABAMA Posts: 3,370	Alot of people do it when they dont properly diagnose the problem and end up replacing alot of good parts __________________ Friends dont let friends use body lifts USMC 92-96 USCG 98 to present

06-18-2005, 10:03 AM	#3
marble75 Junior Member Join Date: Jun 2005 Posts: 6	mabye the acuator motor has a short thats the motor that locks the 4wheel drive i think u might check this and also there are several harneses on the trany that are conected to this . u might start there

08-20-2005, 07:21 PM	#4
Ozymandias Junior Member Join Date: Aug 2005 Location: TN Posts: 3	I can tell you what it is... there is an actuator motor in the front Dif... this thing goes out on a whim.. you can pick up a new one from autozone for like $125 if i remember correctly... however if you do this you're self, there is a new extra wire on the new one, this replaces the temp sensor that was on the factory actuator. ; )

08-26-2005, 10:51 PM	#5
67redbowtie Junior Member Join Date: Aug 2005 Posts: 6	try looking on the side of the front diff.You should have an acuator there w/a wire harness conected to it, I had the same proplem on mine and if you dont use your 4 wheel drive often it will lock in and not engage, what I did was take mine out and pull out the acuator with channel locks while a friend ennergized it in the cab repeated several times untill it was free. After that I will every now n then I will shift into 4 wheel drive even at a stop to keep it in action..........

10-07-2005, 04:19 PM	#6
Kennyray Senior Member Join Date: Oct 2005 Location: Birmingham, AL Posts: 648	On my 95 serria it was the switch on the tranfer case. According to a mech friend of mine they changed the actuator in 96 and started having problems then, so he put a 95 actuator on his 96. Just my 2 cents.

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