Question about 1999 GMC Suburban

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Front drive axke

What lube goes into the front axle of a 99 GMC Suburban, 4WD

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85w 90 weight gear oil.

Posted on Jun 19, 2008

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Dec 25, 2015 | Chevrolet Cars & Trucks

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1999 Chevy Suburban stuck in 4wd


Hi Dale, Sometimes the front diff becomes wound up. I am not saying this is the problem with your vehicle but what I'm about to suggest may work as it often does with other four by fours. Make sure you have a clear space to drive the vehicle backwards and forwards at a slow speed. As you do so select the two high position on the selector. You may need to reverse and go forward several times. Hope it works for you. Regards John

Aug 21, 2012 | 1999 Chevrolet Suburban

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Four wheel drive not working.


Hi there:
Seen a lot of the actuators on these vehicles put the transfer case in the wrong position and cause issues like this. You need a scan tool to watch the data on it and verify correct gear position.

To check the front differiental to see if it is locked in, you can remove the front actuator and see if it extends out when you place it into gear. or you can put it in 4wd, and drive it a few feet, then jack up the front tires off the ground and turn one tire and see if the other tire turns in the opposite direction, If so, the front diff is locked in and the issue is else where.

The place to start with this is to lift the front end of the vehicle. Turn the ignition on and place the truck in 4wd. Then when the front is safely supported, climb under and see if the front driver shaft will turn or if it is stuck. If it turns, then you have issues in the transfer case. If the front drive does not turn, then you need to remove the actuator on the front right and see if it extends in 4wd and retracts in 2wd. If not then you have an actuator or wiring issue. If it does then you have a problem with the sliding gear used to engage the front axle (caused for Damage, lack of lube, weak actuator).

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.


Thank you for using FixYa.

Mar 06, 2012 | 1999 GMC Suburban

1 Answer

My 99 suburban has the service 4wd light on but the 4*4 locks in and everything is working fine and the light came on with the truck running what will be a reason why this happend?


The first thing that I would do is get up under the vehicle and check the lube in the front and rear differential and the transfer case. The 4 wd may still engage but if it is low on lube it will go out soon.

Nov 03, 2011 | 1999 GMC Suburban

1 Answer

4 wheel was working fine all day went to engage it to 4 hi and nothing no lightss on buttons replace a 30 amp fuse under hood but no change 97 gmc sub


There should be a 4wd fuse inside the driver door at the dash by front pillar. Remove cover look inside cover and find 4wd fuse, replace. If it blows again it will most likely need a front axle electronic actuator.

Jan 28, 2011 | 1997 Chevrolet Suburban

1 Answer

1997 GMC Suburban electric 4WD will not engage 4WD


Check the actuator cable that activates the front axle disconnect. It is bolted to the inner fender and the cable runs down to the axle. If you apply vacuum it should pull in and shift the interlock. To see if it is working, jack up the right front so the tire clears. The tire should rotate pretty free. Now engage the interlock. The tire should become harder to turn and the front drive shaft should turn. Now engage the 4X4 (with the trans in park) and see if you can still turn the tire. You shouldn't be able to turn it with the interlock activated.

Keep us upodated (remember to rate this answer).

Dec 22, 2010 | 1997 GMC Suburban

1 Answer

How do you check the fluid on the front axle on a 1999surburban


There should be a plug on the axle housing near where the front drive shaft meets front axle I think on drivers side inline with drive shaft.Remove plug,Fluid should be at bottom of hole.

Dec 06, 2010 | 1999 GMC Suburban

1 Answer

Front seals leaking and gmc dealership says the axles are froze and could not repair without tearing up things or replace with a junkyard replacement front end


If it is 4wd the axles cant be froze if you can drive it because they turn all the time,your 4wd inguages in the chunk.I dont know what seals are leaking but sounds like you need a 2nd opinion

Feb 14, 2010 | 2004 GMC Yukon

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