I see several other discussions with this title but mine seems to be different, maybe. 03 4.0 42RLE. When it's cold it's fine. Once you drive for a few miles it starts quietly and then gets louder the longer you drive. It's really hard to describe what it sounds like, I tried to make a video but you can't hear it. I thought tranny whine at first but it's not. It happens from probably 20 to 35mph and I don't know if it quits or you just can't hear it over the wind noise.
Here is what I can tell you.
It doesn't change with rpm, only actual wheel speed.
It doesn't change if you kick the tranny in neutral running down the road.
It doesn't change if you turn the wheels or hit the brakes hard.
It seems louder decelerating than accelerating but that could be because I can't hear it over my flowmaster.
Here is what I did tonight. I jacked the whole Jeep up an inch off the ground and put my neighbor in it to bring it up to speed. I couldn't hear it outside but inside it's pretty loud.
It doesn't do it off the ground in 2wd so I think that should rule out my tranny.
In 4wd it does it. I think I have narrowed it down to where the front driveshaft goes into the transfer case.
What in that area would cause a whine like that. I am guessing it's the bearing on the output shaft of the transfer case. I am a little confused why it wouldn't do it when it's cold but only when it warms up. If the transfer case was low on fluid could that cause it?
I am open to any thoughts or suggestions.
Here is what I can tell you.
It doesn't change with rpm, only actual wheel speed.
It doesn't change if you kick the tranny in neutral running down the road.
It doesn't change if you turn the wheels or hit the brakes hard.
It seems louder decelerating than accelerating but that could be because I can't hear it over my flowmaster.
Here is what I did tonight. I jacked the whole Jeep up an inch off the ground and put my neighbor in it to bring it up to speed. I couldn't hear it outside but inside it's pretty loud.
It doesn't do it off the ground in 2wd so I think that should rule out my tranny.
In 4wd it does it. I think I have narrowed it down to where the front driveshaft goes into the transfer case.
What in that area would cause a whine like that. I am guessing it's the bearing on the output shaft of the transfer case. I am a little confused why it wouldn't do it when it's cold but only when it warms up. If the transfer case was low on fluid could that cause it?
I am open to any thoughts or suggestions.
