Rear End noise
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Joined: Jul 2004
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Rear End noise
I posted yesterday about a noise from the rear of my 99 F-150 4x4 with 131k miles. After I posted I thought I was at the conclusion of tire noise, however I am rethinking that since it seems to be getting worse or maybe my imagination.
Anyway here is what I know, a few months ago I took it to a local shop for vibration from the rear end, it needed u joints and I was told the pinion bearing was going out, I took it to a specialty shop where I was told the bearing was fine and off I went.
Now I have a noise from the rear end that seems to go along with the speed of the drive shaft, I have checked the fluid and it is full, I have checked for play at the yoke there is none, the noise is constant during accel and decel.I have even jacked it up and put it in gear and didnt hear anything abnormal. When I have the front wheels turned and I take off there is a little vibration.
I like to think that I am well versed on auto mechanics but when it comes to differentials I am lost, not sure what is going on or what exactly I am hearing. I also dont know how much time I have before something goes bad wrong.
Any thoughts would be appreciated.
Anyway here is what I know, a few months ago I took it to a local shop for vibration from the rear end, it needed u joints and I was told the pinion bearing was going out, I took it to a specialty shop where I was told the bearing was fine and off I went.
Now I have a noise from the rear end that seems to go along with the speed of the drive shaft, I have checked the fluid and it is full, I have checked for play at the yoke there is none, the noise is constant during accel and decel.I have even jacked it up and put it in gear and didnt hear anything abnormal. When I have the front wheels turned and I take off there is a little vibration.
I like to think that I am well versed on auto mechanics but when it comes to differentials I am lost, not sure what is going on or what exactly I am hearing. I also dont know how much time I have before something goes bad wrong.
Any thoughts would be appreciated.
Hotshot
Joined: Jul 2005
Posts: 11,931
Likes: 180
bearings are normally the pinion or the end of the axle shafts. Jake the back tires a couple inches off the ground. Rotate eahc tire and pry it up and down. Listen for noise or excess movement. The tire will move in and out about 1/16 inche, but not up and down or wobble. Next grab the drive shaft and push it up and down , sideways. Do you feel the pinion shaft moving at all ? Sometimes you will see oi leaking around the seal if a bearing is going out. How much backlash do you have ? Put both tires on the ground and block one so it wont roll, put the transmission in neutral. grab the drive shaft and turn one way , then the other. the "slop" is how much backlash you have. Gear clearance is a few thousandths. Will be excess if bearing is going out.
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