So the truck was working great in 4 low and 4 high. We had a real bad snow and deep freexe out here over the last 3 weeks. The droped the truck into 4 low while in the snow and every thing was fine. Got home and pulled it back to 2 wheel drive and parked it. The next morning I went and put it back into 4 low and had no front movement or traction. SO I tryed 4 high and still nothing. I have been under the truck andthe drive line is still there, solid to movement by hand as shoud be.
I saw two electronic units by the transfer case, and I disconexcted them and re conected them, and still nothing. I dont see any linkage as the shift unit is a top loading shifter.
Can or does the self locking hub units burn out or freeze up on these 4 runners? and is there a way to fix them with out replacing them with manual locking hubs?
Any and all input would be great on this
The self locking hubs (or automatic hubs) are actuated by vacuum. The vacuum line is usually on the driver's side of the differential, towards the front of the vehicle on Toys. You might want to check it out and see if it's cracked, broken, or gone.
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I had a 4 wheel drive suburban..it had issues with the high-lock and low-lock..I just used the auto setting because all four wheels were getting power anyway..only time you need lock is when you plan to go bogging in really deep mud..on snow/ice all you need is all wheel drive..you actually have better control..as long as it works in all wheel you should be fine..also be checking the front hubs.. are yours full time or do you have lock outs..on the axle hubs..thats my question
The transfer case may be hanging up, have you ever had it serviced with new fluid? If not do so and drive it for a few miles and try again, if that doesn't fix the issue you will need a shop to inspect the transfer case actuator motor and position contacts.
you have a lever or switch that engages 2wheel normal driving 4 wheel high for wet slippery conditions ,then you have four wheel low for real muddy and deep snow conditions
normally change from 2 wheel to four wheel high on the move .important nearly all 4 wheel drive vehicles must be stopped to engage low otherwise do damage to transmission
normaly you drive in 2 wheel dive rear whee lls driving jeep
when you select 4 wheel high or 4 wheel low you engage all 4 wheels bring intthe front axle and all 4 wheels drive high box for slippery roads ice snow etc
important low box only for extreme conditions such as heavy mud deep snow etc
LOW MUST BE SELECTED WHEN STOPPED OTHER WISE DAMAGE TO TRANSMISSION
hope this helps
under 35mph its normally recommended that you utilize 4 wheel low it is good for maximizing the torque needed to pull out of deep snow. Moderate-Aggresive Mud and Snow tires also work hand in hand. ~Daniel.
The truck(if it's a 4x4 and not a 2x4)has an automatic setting where the truck is in automatic 4 wheel drive when it's needed. If it becomes to harsh out with deep snow, the you must turn the dash mounted switch to 4x4 high, but do not drive in 4x4 high if the ground it dry. The high 4x4 is intended for deep snow or loose sand and dirt. The switch is on the dash just to the upper left side of your radio. If there is No switch, then you may have the FULL TIME all the time 4x4 type and then it's always in 4x4 mode. Hope that helps...
fuses relays in engine compartment or in dash board . look at transfer case look for vacuum lines or electric lines.its probably electric. because most 4 wheel drive uses electric motors.99 up to 2009s model.
I love driving 4x4 jeeps, especially in 4-wheel drive. First, a list of when you should and should not use 4-wheel drive.
2x4 Hi is for normal driving in most weather and anytime you are driving over 50mph.
4x4 HI is for getting you unstuck from mud or snow and can be used up to 50mph but is not recommended for much faster. It is only designed to get you moving and unstuck, it will NOT make it any safer to drive faster on slick surfaces like rain, snow, or ice. Always drive slower on these kinds of surfaces.
4x4 lo (low) is for extreme 4x4 driving like trail riding and mud bogging to get over steep inclines and deep mud without burning up the clutch. 4x4 lo should never be used to drive faster than 25-35mph and should only be used in off road situations.
Neutral (on the 4x4 shifter) is mainly used if you are towing your jeep with any of the wheels on the ground. It completely disengages the transmission from the drive train so you can tow it without damaging the trans.
Now, to shift from one to another. My jeep may be different than yours and I haven't driven my jeep in a while (I had to sell it) but it should shift the same way.
First, make sure you are parked and the wheels are not moving. Put the main gear shift (5-speed) into Neutral, hold down the clutch and move the selector from 2x4 to 4x4 by first pulling the shifter to the side then moving it up or down. Some jeeps (especially older ones) may have a wheel lock on the outside of the wheel hub (AKA hub lock). This must be in the "LOCK" position for 4x4 and "UNLOCK" for normal 2x4 driving. Make sure it is fully engaged in the slot before shifting into 1st. Then you can drive normally, following the guidelines above.
The regular 5-speed transmission will shift just the same as before but you will notice that the jeep will drive much slower in 4x4 lo and it will have much more torque for those really sticky situations.
Good luck! Have fun! And if you do plan on doing some real 4x4'in or mud boggin' make sure you buy a winch for the front of your jeep or bring a friend who has a winch on their truck to get you unstuck from the worst of the worst! Don't forget to rate!
P.S. if you have problems with one or more 4x4 settings you can always shift back to 2x4. Make sure that if you are driving on the highway or in normal driving conditions, you are always in 2x4.
P.P.S. If you are near the Columbia, MO area send me a PM, I'd love to find some new friends to do some 4x4 driving with in the area so I can get back into the sport. I miss it.