I have 31's on my 97 xj and when I put it in 4H the other day she whined really loud what would cause that?

 

What tcase do you have? Were you on pavement?

 

How fast were you going? Do you have a transfer case drop?

 

mine use to do that ,, so I stopped taking the wife with me ...sorted ..

 

was it as you were shifting into 4wd?

did you shift trans into neutral before you pulled on the 4x4 lever?

 

He shouldn't have to with a 231 going into 4Hi

 

he didn't state he was moving.

 

True

 

I was on pavement and I have no clue what tcase it is :O.

 

Ok

Your axles need to rotate at different speeds when the vehicle is not traveling in a perfectly straight line in order to keep the outside wheels from dragging, or the inside wheels from skipping depending on the situation. A differential allows that to happen.

When you are in 4wheel drive (with a 231 transfer case) the engine is trying to give both the front and rear axles the same rotation. In a straight line this is fine on pavement, but if you try and turn on pavement the wheels need to travel at different speeds or you will start damaging driveline components. When you're off-road I.e dirt, gravel, snow, mud, etc the wheels can slip and spin all they want and still maintain the same speed (wheels, not the jeep) and your driveline will be happy. More or less anyway.


So to recap; on pavement, there is too much traction which means the wheels need to travel at different speeds or bad things (like your whining problem) will happen. Offroad your wheels can slip so that they are all going the same speed, less damage to driveline under normal circumstances.

Questions?

 

Ever checked the fluid level in that transfer case?

Here's how to shift bTW>

Here's how the factory suggests you shift the transfer case and I've been doing this since these things were new and I worked at the dealership. Quoted from the owner's manual.

"To engage, shift the transfer case lever from 2H to 4H while the vehicle is moving at any legal speed". I let off the gas, throw the lever, and then tap the gas and let off.

4L position: " To engage, slow the vehicle to 2-3 MPH , shift the transmission to Neutral, then shift the transfer lever to the right and pull firmly rearward to 4L".