Question about 1998 GMC Sierra

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I have a 98 gmc sierra, posi-track has been working until lately, I put new 80-90 weight oil in it but hasn't come out of it yet. There seems to be no wear on the inside, any ideas

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If it a posi traction you need to put additive inside maybe you put oil with additive inside but its not enouht go to part at gm dealership ask posi additve 2 bottle it will work fine after since you said the were no damaged inside HOPE IT HELP FIXYA OUR POST thanks pierre

Posted on Jul 09, 2008

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Why 4x4 doesn't turn all 4 wheels at same time? 4hi-4lo


4X4 actually provides power to the front 2, and the back 2.
Unless the back has limited slip or posi-track, if 1 wheel spins, the other will not turn.
Since the front wheels have to turn at different rates to accomodate turning radius differences, there is (usually) to limited slip on the front differential, so if one wheel spins, the other will not turn.
So, if you have one front wheel spinning at the same time as one back wheel is spinning, and you don't have posi-trac, you're stuck.
Cheerfuls.

Nov 11, 2015 | 1998 GMC Sierra

1 Answer

Ok so if i get a rear end from the junkyard and try to get the same one its gonna cost me more just cuz its a limited slip posi.? So then would it be possible to get an old one that has drum brakes a


You take yours apart & make the necessary
repairs,you don't want some elses junk from
a salvage yard

There is only 3 things that could happen to your

The outer axle bearings
The Posi Clutches
Or you ran it out of fluid from a leak,
in which case you install new carrier
bearings & clutches

If it could do that at 19 with no experience
or help 48 years ago ,well !

Mar 15, 2013 | 1999 GMC Sierra

3 Answers

2003 gmc sierra rear differential oil how much and what kind is recommended


85 or 90w will be fine, take the differental plug out and add fluid until it just does start to run out of check hole

Jan 14, 2011 | 2003 GMC Sierra 1500

1 Answer

Need to change rear seals in axcles how to? 98 gmc jimmy


First i would check to see if the axle air vent was clear if its not the oil is vary heavy and expands a lot this will build up pressure inside the houseing and cause the axle seals to leak if you can clear it the problem may fix it self its 80 90 weight oil thats thick stuff. If not you need to remove the rear wheels and brake drums then you have to remove the cover from the rear carriar catch the oil. Look inside the carriar houseing you will see the ends of the axles theres a small clip on each axle called a c clip remove them you can pull them out with your fingers. Then you can slide the axles out past the brake plates pry the seals out you might as well replace the bearings when your doing but thats up to you. Lube and install the bearings then the new seals you will need new seals lube the seal lips and vary carefuly slide the axle in taking care not to damage the seal install the c clip do the other side put a new gasket on the rear carriar tighten bolts to 20 ft lbs. Refill carriar 80 90 weight oil through filler plug on the side of the houseing until it just starts to run out hole put the plug in the rear drums on and wheels

Dec 30, 2010 | 1998 GMC Jimmy

1 Answer

95 gmc 2500 manual transfer case. Cold as hell this morn and it would not go into 4hi or low but it felt like it wanted to??????????


Drain the oil, probably 80,90 weight and fill it with transmission fluid, this will solve your problem

Nov 16, 2010 | 1991 GMC K2500

2 Answers

Why is my 94 gmc c1500 low oil pressure.


You may have a bad oil sending unit this is located under the hood near the oil filter two wires are connected to it. i would change this and see if your problem persists, if so you could have an oil pump you wont hear anything until its too late. 20 psi is all you need to keep it alive. good luck

Apr 16, 2010 | 1994 GMC Sierra

2 Answers

Want to change gears in rear end for posi traction in a 98 gmc25000 is this possible?


It is possible, you just have to know what gear ratio you have in your Sierra. I had issues with my son's rear differential and did the Salvage Yard and picked one up for $250.00 with less then 45,000 miles. Remember new cars end up at Salvage Yards also.

Here are the Pro code for the rear ends to your Sierra and you can match one up at a Salvage Yard.
GQ1 -- AXLE REAR, STD RATIO
GT4 -- AXLE REAR, 3.73 RATIO
GT5 -- AXLE REAR, 4.10 RATIO
GU4 -- AXLE REAR, 3.08 RATIO
GU5 -- AXLE REAR, 3.23 RATIO
GU6 -- AXLE REAR, 3.42 RATIO
G80 -- AXLE REAR, LIMITED SLIP (POSI TRACTION)

HC4 -- AXLE REAR, 4.56 RATIO

Open Your glove box and look inside it. Should be a list of codes on the bottom.
Example: GU6 G80 According to that, you'll have a 3.42 posi

Good luck and keep me posted and call around Salvage Yards, there prices will differ from one to the next salvage yard and don't ask them for a posi rear end. The cost will you more, just search all the SUV's and look at the pro codes in the glove box. Hunt, most awd system SUV will have the G80 rear end.

Good luck and keep me posted.

Jan 10, 2010 | 1993 GMC Sierra K1500

1 Answer

2000 gmc both rear tire oil leakage.


You are correct, it's not brake fluid. Check the level in your rear axle, it sounds like you have bad seals in the axles allowing the rear differential gear oil to leak inside the brake drums.
This is a heavy weight oil, 80 or 90 weight. This leakage will ruin your brake pads, and if enough leaks out, your rear differential will blow. The seals aren't expensive, but it's a lot of labor to pull everything apart to get at the seals, plus new rear brakes. My Ford ( and I'm sure your GMC) require removal of the rear axles to change the seals. Good Luck! countrycurt0

Sep 17, 2008 | 2000 GMC Sierra

1 Answer

2005 GMC Sierra 1500 rear noise


you need to check you universal joints usualy the one on the rear axel is the first to go. i recomend to put bolth in at the same time. the new ones will be greasable so dont forget to give them a little every oil change

Aug 23, 2008 | 2005 GMC Sierra

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