Question about 1999 GMC Yukon

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Driving in 4 High

I am just wondering if it is bad for the truck to drive it at high speeds in 4WD Hi. It shakes when I go fast in 2WD but does not when it is in 4HI, is it bad for it to drive on the freeway in 4 Hi?

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It is only Rated at 50 MPH at the Fastest in 4 HI and Short Distances. Anything above this and the Transfer case Could Shell out. It is Pretty Expensive to Rebuild the Transfer Case and it could Cause Electrical Problems with the Tranny Also.
Please Rate My Response! Thanks!

Posted on Jan 31, 2009

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How is four wheel drive used on a 1999 durango


Hi Ralph.

I do not own a Durango, but have owned many 4WD vehicles and can offer tips for proper usage.

The "L" and "H" after the 4 and 2 stand for "Low" and "High" ranges. The 2 and 4 stand for the number of wheels that can receive power from the engine and transmission. Most 4WD vehicles only provide power to 1 wheel on each axle (front at rear for a total of just 2 wheels powered) at any given time (but for purposes of discussion, we'll call it 2WD & 4WD, as advertised).

Generally, "2WD" is only offered as a High range and is the same as a "normal" 2WD car or truck. I haven't seen a car or small truck that offers 2L (but I haven't seen a Durango - so I don't know), but generally 2WD traction can be increased easily enough by simply shifting the transmission to a lower gear (From "D" to "2" or "2" to "1", etc.).

4WD is designed to provide additional traction whenever 2WD isn't sufficient. This can be when surfaces are slippery such as sand, mud, snow and ice or, when pulling a heavy load such as a trailer and tires are not gripping the surface well. Shifting from 2WD to 4WD High will provide more traction at the same tire speed. Maximum power from the engine does not come at low RPMs, so in order to get more pulling power from the engine with out increasing speed (or spinning tires), the transmission should shifted into a lower gear. This is especially helpful when pulling a trailer up a wet incline, etc. If 4WD High in 1st gear is still allowing tires to spin or not providing enough pulling power, then shifting the transfer case from 4WD High to 4WD Low will allow the engine speed to increase (providing more power) without increasing the speed of the wheels (reducing the chances of spinning tires).

4WD should never be used while operating on dry pavement. Since tires wear at different rates, and turning left or right slows the inside tire and speeds up the outside tire when compared to the rear tires, a certain amount of slip is required. Wet surfaces provide this necessary amount of slip - as does sand, mud, snow, ice, dirt, gravel, etc. You should take the time to see how each selection of High and Low affects engine speed and vehicle speed and how the surface and any trailer further changes traction. With a little experimentation, you'll see how it works and be able to choose the right range with little thought.

Don't forget to have the transfer case & front differential fluids checked and changed as per the manual. Neglecting this simple service intervals can leave you stranded when you need 4WD and can be very expensive to repair.

I hope this helps & good luck!

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How to put a 95 or 96 jeep cherokee sport in 4 wheel drive. handle is left of the gear shift.


You can change on the run but as a general rule stop to change to 4wd.except 2wd to 4wd high.Just slow down to about 15mph and back off the gas.
2wd high is normal running
4wd high(is full time 4wd)this is slippery roads or muddy roads.
4wd high lock For bad and slower slippery and rocky roads.
4wd low lock is for extreme 4wd conditions
Don't use the last 2 on the main roads or transfercase will be damaged
Hope this helps

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Just got H 2 2005 4 buttons 4 the 4 wheel drive


Use 2 wheels, the other 4wd low ,for climbing at slow speeds: 4wd high, for driving on low traction roads,like mud or snow,at medium speeds: 4wd auto full time all wheel drive, for highway speeds on slippery surfaces, like rain or light snow.

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I just bought a 2004 grand cherokee V8 for my son. It has 4wd but the stick slides easily between 4wd all the time, Neutral and I'm wondering if that means it's not working? The whole point of buying was...


Not sure what you mean by "4wd all the time, Neutral".
But I can tell you how it's supposed to operate.

The three modes are 2wd, 4wd high and 4wd low. When switching between 2wd and 4wd high it makes no difference whether the Jeep is moving or in neutral. The only condition that needs to be obseved when switching from 2 to 4 high is the speed of the Jeep. It should not be done above 45mph.
The switch from 4wd high to 4wd low is a different animal. The Jeep must be stopped and in neutral. Also you should be aware that it is not a pleasant sound or feel when moving from high to low so you should worry to much about the lowed junking sound.
At times it may even be necessary to put the lever back to the high position and move the Jeep a couple feet to align gears before it goes into low.

This is the reason for the relative ease when switching from 2wd to 4wd high.
There is an art to switching from 2wd to 4wd high then to 4wd low. Once your son becomes familiar with the Jeep and begins using the different modes it will become easier.
I would like to add one more piece of advice. After building Jeeps for over 25 years and owning several I have found that 8 out of 10 times that 4wd low is used, it's used incorrectly or not needed at all. It's a good idea to find someone who has experience with 4wd to give a bit of instruction on how it should be used. Especially in the mountains.
Let me know if you need any clarification on anything.
I hope this helps.

Oct 13, 2009 | 2004 Jeep Grand Cherokee

1 Answer

High pitch whine


sounds like your one of your hubs on the front axle are staying engaged when you turn off the 4wd. By reselecting the 4wd high and back to 2wd hi it is causing it to release. Get it looked at these can get expensive if damage is done.

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