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Rav 4 is an all wheel drive vehicle not a 4 wheel drive as in jeep or Landrover. When you press the 4 wheel lock it activates a lock dog in the transfer case that means both front and back axles now drive as long as you have traction on at least 1 axle set. There is no means of allowing the front axle to speed up and slow down in relation to the rear axle ( as in going over a speed bump) and you get axle wind up which puts a load on all the drive train . The faster you go the bigger the load and so it kicks out over 25mph as obviously there is no need to have both front and back locked together at speed . It also makes steering harder to turn
Your JEEP is only part time 4WHEEL DRIVE as you can't DRIVE on the STREET with it, its NORMAL and nothing is WRONG.
Part-Time and Full-Time 4x4 systems...
A part-time 4x4 system called Commandtrac is in all Wranglers together with low-end Cherokees and Liberties. A part-time 4x4 system locks the front and rear driveshafts together inside the transfer case so they drive the front and rear axles together in lock step. Because they are locked together, the front and rear tires must rotate at the exact same rpms. However, the front tires must rotate faster than the rear tires during any turn so a part-time system fights that... which makes a part-time system inappropriate on a paved road because the high level of traction on a paved road prevents the tires from slipping which would otherwise allow the front and rear tires to grudgingly rotate at different rpms. Offroad this is not a problem since the poor traction of an offroad trail allows the tires to slip as needed. But when they try to slip/rotate at different rpms on a high-traction surface, the entire drivetrain is stressed which is bad for it. This problem is called "wind-up".
In reality however, the front and rear axles really don't even turn exactly the same RPMs when you're in 4wd so you still get "wind-up" if you drove in 4wd on the street even if you drove in a perfectly straight line. Why? Because 1) you can't drive in a perfectly straight line and 2) the front and rear axle ratios are usually .01 different from each other. Like a 3.73 and 3.74, 4.10/4.11, etc.. Why the .01 ratio difference between the front and rear axles? Because the front and rear axles usually have different ring gear diameters which makes it nearly impossible for the gear manufacturers to economically make the front and rear axle ratios exactly the same. And no, they are not made .01 different on purpose to make the front or rear pull more when in 4wd, that is an old wive's tale.
Finally, a full-time 4x4 system like Selectrac is available on Grand Cherokees, Cherokees and Libertys couples the front and rear axles together, but they are not mechanically locked together like they are with a part-time 4wd system. The front-to-rear axle coupling can be done via either a differential like the Selectrac system uses (just just like what is in the center of an "open" axle) or a fluid (viscous) coupler. The benefit to a full-time 4wd system is that because the front and rear axles are not mechanically locked together, the front and rear tires/axles can rotate at different rpms from each other. This allows a vehicle with a full-time 4wd system to drive in 4wd "full time" on a paved road without problem since there is no 'wind-up' problem to harm the drivetrain. You cannot get a full-time 4x4 system in a Wrangler from the factory.
It is more likely you have a defective tire, shimmy is not the symptom of loose front end parts in this model. Most tire shops can drive this and give you a preliminary diagnosis and repair cost free of charge.
It can be several things. With the problem only occuring when power is applied you must have a problem with the Right Hub engaging when it should be off. Or depending on your 4 wheel settings the Left Hub is not locking when it should match the Right.
The rear suspension can also be the problem. There are Rubber bushings in the Rear suspension arms. If there is looseness or travel in the joints the rear axle can shift under Power. This will allow the rear wheels to run crooked. This will make the front end of your Explorer turn to one side. On some models the rear wheels can be aligned and have Shims in them. Sometimes the shims can fall out causing the axle to pitch to one side.
There are many things turning in the frontend. But most will pull all of the time if they are failing. The problem you describe limits the possibilities to the parts I have mentioned. Good Luck on your repair.
The rear diff. turns the rear wheels. It is located in the middle of the rear axle. It won't last long if you ignore it. May just need dearing's but if it is driven the cog wheels will grind to dust or drop off this can cause the rear axle to seize up and can be a danger because the back wheels will lock up. If you are going to fix it yourself let me know and I will be able to guide you through the process
only on right turns?? a smaller tire would have resulted in damage if the rear is a locking type rearend. IF it is a locking rear end I would change the oil, noting the color and how it looks. replace it and add some "slip additive"............. IF its not a locking type axle, maybe a spider gear problem, but thats inside the housing, not out by the wheel. You may need to take the axle out and inspect the axle/ bearing.
Hello, You could have a central locking pump running all the time because you have a failure, (leak} in the system. It could be door lock actuators, trunk lock actuator or gas lid actuator or maybe a pump failure. It's located under the rear seat on the passenger side. You can pull the seat up and check to see if that is the problem.
If you find this information to be correct would you please enter a "fixya" rating. Thanks, Gator241
If no oil on the driver side, you have a locked up parking brake pivot. Follow the park brake cable to the inside plate of the rear wheels. on the outside, where the cable connects, look to see the position of the visible mechanism connected to the cable. It probably will not match the side that is not locked up. This is a very common problem; you need to replace the park brake pivot. Additionally, you are going to need to remove the other side axle shaft and get the leaking oil seal replaced. Replace the brake shoes if they have oil on them.
Hey guys , i got one that i think i know whats wrong but i want to check with others to see, ok so here it is my lock switch on the drivers side only unlocks the doors it does not lock but all the other lock switches in the car fully work so im thinkin maybe its the driver side door lock switch.
This is a common problem with this model. If you access the wires in the boot between the door you will find a broken wire about an inch from the connector. Hope this helps!!