Question about 2001 GMC Denali

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Our 2001 Denali front differential

Our 2001 Denali started making a slipping type of noise when you make a hard turn left, right foward or in reverse.But only when the engine was hot. Had the Differential oil changed and there were metal shavings in the front dofferential oil. Now the problem has become much worse and the noise and steering problems are even when cold.

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Sorry thats just wear tear in the unless it was a huge amount and large chucnks of metal then somethings wrongs. It dosent have a U joint problems does it

Posted on Jul 28, 2009

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Jeep grand cherokee quadra drive


Differentials.

The Jeep Quadra Drive systems have a limited slip differential in the transfer case as well as the front and rear axles - which allows you to run all wheel drive on all surfaces. This matters because without limited slip capability your transfer case & axles would break.

Have your transfer case and axles serviced by a dealer, really a real dealer for Chrysler Jeep. These diffs and transfer cases can use unique gear oils that you don\'t want to mix up with regular gear oil.

That howling, clunking, grinding noise is your dog-clutches slipping (as designed) as you go around the corner.



Additional Details below:

So what\'s the Diff?



All differentials are is a way to allow for different wheels to travel different distances on the same vehicle. What-he-say? Yep, when we turn a corner all 4 wheels go a different distance around that corner... oh yeah well everybody knows that. Think about it, your making that hard left turn at your favorite Fast-Food joint; your left front wheel is 2 feet away from the curb, but the back left wheel rubs the curb... why?

As you make that 90 degree turn, your left back wheel travels 4 feet, your left front wheel travels 6 feet, your right rear wheel travels 7 feet, and your right front wheel travels 8 feet.



Ok you say, what\'s the big deal? A couple feet slip here a couple of feet slip there... Well remember your sticky rubber tires on dry asphalt don\'t really give very much and u-joints, axles shafts, and even pinion and ring gear damage can occur. Fortunately for us, Leonardo DaVinci (yeah really) saw this problem coming and designed the Open Differential. There are mini-gears inside your open differential that allow for that slippage, these mini-gears are called spider gears. Problem is when your in snow, ice, mud the spider gears of the open diff allow all your power to go to the wheel with the least traction (and your stuck).

Ok let\'s put another powered axle up front and call it 4x4. Umm no.

A normal 4x4 is not really true four wheel drive. At best it\'s the worst 2 wheels you\'ve got - driving you forward. Until both wheels on the same side are in a ditch, and your stuck.



Well what the heck Leonardo? I want something better than stuck!



The old-time dragster dudes of the 50\'s & 60\'s agreed with you and they welded those little spider gears together for true positraction across both wheels. Ever been close to a big monster truck in a parking lot and heard its tires chirping around the corner? Or an old Jeep crow-hopping it\'s way around a corner - Letting out little tire noises (like "erp" "erp" "erp")?

That\'s because these 4x4\'s have been modified to not have any differential action. None. This is great in a 1/4 mile dragster race or a mountain climbing rally car. A locked front differential can (and most likely will) cause you to crash... not good for daily drivers.



You\'re in luck, the Limited Slip Differential (LSD) has clutches instead of spider gears, which engage as wheel slippage increases. Subaru and Audi are 2 companies that really brought this to market with All Wheel Drive decades ago. Jeep and other SUV/Pickup manufacturers have utilized clutch-based LSD\'s as well. Clutch-based LSD\'s however, have a limited lifespan and can require special gear oils. When Clutch-based LSD\'s fail, they basically become an Open Diff.



Automatic locking differentials were brought to market in the 70\'s & 80\'s by companies like Detroit Locker, and these engage a fully locked set of gears as soon as any slippage occurs. Problem is it can become very difficult to steer, at all. Forget about U-turns, just go around the block. And while your at it, stop and pick up another set of tires because it will feel like you are dragging your outside tires around every corner.



Jeep and Daimler-Chrysler developed another type of LSD that utilizes a small hydraulic pump to engage a set of clutches and gears, which lasts much longer than traditional LSD\'s. It was called a Gerodisc differential, and it worked fairly well. Not as much traction as a full locker, but good LSD performance. The problem was the Gerodisc couldn\'t control itself in the car-washes, and would build-up pressure as the tires slipped over the soapy rollers, and launch the Grand Cherokee across the car wash. Yeah, it was freaky. So freaky that the National Car Wash Association of America (yeah they have an association, who knew?) prohibited all Grand Cherokees. Look it up.



The King Daddy of differentials is the selectable locker. These little gems are very expensive, but you get all the benefits of both the open diff for maneuvering, and lockers for traction only when needed.



So that noise, while it may not spell imminent doom, surely ain\'t good.

Jan 02, 2014 | Cars & Trucks

3 Answers

My front differential is making a whinning noise on 2001 yukon denali what is the cause and the sollution(do I need o replace the differrential?)...thank you


Sounds like you need to replace your ujoints. Or possably your carrier bearing. This is most common in these vechiles.And is part of your 100.000 mile tune up.If you need help replacing let me know.If you have to take to a shop it would cost around $50 plus parts. Best of luck to you and thank's for using Fix Ya

Apr 18, 2011 | 2001 GMC Yukon Denali

1 Answer

Have a 2004 Avalanche 1500 that has rear end noise that get louder turning to the right and goes away turning to left. Also upon excelatation noise not so loud coasting noise get louder have checked rear...


Suspect a worn left side spider gear or it's bearing in the differential. If a limited-slip differential, the left side clutch may be grabbing somewhat. In any case, the differential will need to be removed from the case to service any worn or defective components. Rear end service is not for inexperienced mechanics. Have you checked the fluid level in the differential? Hope this helps!

Nov 05, 2010 | Chevrolet Avalanche Cars & Trucks

1 Answer

What type of fluid is used in my diesel 2001 F350 front and rear differencial?


Front differential is: 75W-90

Rear Differential is a little different...what type of differential...limited slip or standard differential? Dana 135?


Axles subject to frequent trailer towing in hot or
hilly conditions may use Synthetic 75W-140 GL-5

Jun 10, 2010 | 2001 Ford F350 Super Duty SuperCab

1 Answer

Hello, with all 4 wheels off the ground,engine running and in gear only 3 wheels are turning. The right front does not. is this normal?


Unless you have a positraction rear differential, I'm surprised that even three are turning! Four wheel drive is really two wheel drive because both differentials are "open" type. In an open diff, only one wheel has power at any given time. With a positraction, or "limited slip" rear diff, both rear wheels push with fairly even force but the outer wheel is allowed to slip when going around turns. Only true four wheelers have either a limited slip on both ends or "locked" units but it is impossible or really difficult to drive anything like that on the street. If you hold the left front wheel from turning unless the locking unit is broken, the right front should turn.

May 10, 2010 | 1998 Jeep Grand Cherokee

1 Answer

The problem sounds and looks like its in my rear end when i turn left or right my rear end acks like its locked in and my rear tire sqeel but when im driving foward or back it dont act up. it only does...


Sounds like you have a limited slip or " Posi-Traction" rear differential, if this is the case than go to the GM dealer and ask them for a bottle of friction modifier oil for limited slip differential. This stuff is pure whale oil that helps to lubricate the clutches in the differential. After adding the lube find your self a big empty parking lot or other paved surface and drive the vehicle forwards then backwards in a slow figure 8 patern, turn as tight as you can each way, this will force the clutches to work and help limber them up. The differential might make some crunching sounds, but the noise should quit as the lube gets in and does its job.

Apr 14, 2010 | 2004 Chevrolet TrailBlazer

2 Answers

Front Driver Side


If the noise changes when you turn side to side while driving you have bad wheel bearing. (Hub Assy)
Hope this helps you,

Oct 09, 2009 | 2001 GMC Denali

1 Answer

Trans axle


Not a problem... I've seen it happen the other way around (depends on the difference between the friction generated by one brake pad/caliper (right/left side) compared to the other against the rotor). The Trans is the 'SLIP DIFFERENTIAL' type.. if the noise is loudest when one wheel is turning while the other is NOT, THEN stop the wheel that's turning to see if the noise goes away when the other wheel turns. If it doesn't, then the problem is in the differential. If it does, further diagnosis is needed.

May 10, 2009 | 2003 Hyundai Tiburon

2 Answers

2006 Honda Element EXP - 40K miles


I have a 2006 Honda Element as well, and mine started making "rubbing" noises when I made a slow hard turn left or right. It had 49K on it. Took it to a dealership and had it looked at. The technician knew what it was right off the bat. The rear differential needed to be serviced. Said the fluid had broken down and needed replacing. $79.00 to fix. CRV have the same problem. Just get it serviced and it should be ok.

Jun 16, 2008 | 2006 Honda Element

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