Whinning sound from back of truck

[rudedawg1085]

Anyone ever have a whinning sound coming from the back on their diff case?? latley its been getting worse and wrose and the faster i go the louder it gets. I opened it up, drained the oil, but there were no metal shavings like i thought i would see, and the teeth of the gears were perfectly smooth. Also someone told me if it the pinion bearing was bad you would be able to shake the drive shaft, but its stays stiff when i try....any thoughts?

[pianoman9701]

Yes, I've had this. I ran over my first wife, her dress got wrapped around the rear axle, and the whining didn't stop for, oh, about 3/4 of a mile. The same thing will happen if a liberal gets stuck there, except the whine will be a much higher pitch. I hope this was helpful.

[tshoote30]

Yes, I've had this. I ran over my first wife, her dress got wrapped around the rear axle, and the whining didn't stop for, oh, about 3/4 of a mile. The same thing will happen if a liberal gets stuck there, except the whine will be a much higher pitch. I hope this was helpful.

      

[Mudman]

 :chuckle:Is it high or low pitch?  Sounds like a bearing.  Kind of stupid question sorry, but tires wearing down can start to hum-whine?  What kind of truck,diff.?

[jackelope]

What kind of truck? And are you sure it's coming from the rear? Does the noise change when you make turns?

[rudedawg1085]

Its a 2006 F-150 XF4 5.4 triton. Yea im positive its come from the diff case. I threw it up on jacks and had my buddy step on the gas as i put my ear up to the diff case  maybe not the smartest idea....

the sound dosent change when i turn

[huntnphool]

Its a 2006 F-150 XF4 5.4 triton. Yea im positive its come from the diff case. I threw it up on jacks and had my buddy step on the gas as i put my ear up to the diff case  maybe not the smartest idea....

the sound dosent change when i turn

Ive heard that sound before, kinda sounds like $$$$$$$$$$$$$$$$$ going down the road?

[gaddy]

do the jack test again & use a small piece of hose  with one end up to your good ear & try to pin point the whine. is there a dust cover on the pinion yoke? seen those get bent by a kicked up rock. & still could be bearing even if the yoke is tight. also seed dry u joints squeell & resonate.??

[JimmyHoffa]

A guy I know had something like this.  It was a differential pin.  It got loose and would make a whinning noise.  The faster the truck went the worse it got.  Never saw metal shavings in the case.  One day the pin finally dropped while the truck was in motion and completely destroyed the rear diff internals.  Locked it up too.  The tow truck had to get creative to load it up.

[Woodchuck]

Its a 2006 F-150 XF4 5.4 triton. Yea im positive its come from the diff case. I threw it up on jacks and had my buddy step on the gas as i put my ear up to the diff case  maybe not the smartest idea....

the sound dosent change when i turn

Ive heard that sound before, kinda sounds like $$$$$$$$$$$$$$$$$ going down the road?

[Austrian Hunter]

I had a whining/grinding noise from the differential case on my 2004 F-150 and it took them a while to find the problem.  It was actually a computer chip sending the message to go into four wheel drive but then retract because the truck was set in two wheel drive, it was a $54 part and it took them two days to find 

[NateR]

Had the same deal last year...turned out to be an axle bearing.

[rudedawg1085]

I had a whining/grinding noise from the differential case on my 2004 F-150 and it took them a while to find the problem.  It was actually a computer chip sending the message to go into four wheel drive but then retract because the truck was set in two wheel drive, it was a $54 part and it took them two days to find 

Thats good info to know, thank you.

[CamoDup]

Ever find out what it was? My wife's 4runner has a whine also and I can't figure out what it is!

[coachcw]

If the tone changes off and on the gas it's typically pinion bearings , constant noise is often a side carrier bearing . axle bearings with often show leakage or play when they get worse.

[Heredoggydoggy]

Yes, I've had this. I ran over my first wife, her dress got wrapped around the rear axle, and the whining didn't stop for, oh, about 3/4 of a mile. The same thing will happen if a liberal gets stuck there, except the whine will be a much higher pitch. I hope this was helpful.

      

Mine turned out to be a liberal, but the whine came from the FRONT axle...for some reason!

[rudedawg1085]

Yea i got it back last night, It was the pinion bearing, i had it replaced for $450, includes tax, parts, and labor. Not to expensive, but with the tax return its no biggy, She runs like a champ again now. Thanks everyone for the help!

[rudedawg1085]

which reminds me to ask, is $450 a good price?? it sounded good to me at the time, but maybe thats casue in my mind i was thinking it would be a $1000 fix

[Woodchuck]

Sounds fair to me. .02

[Heredoggydoggy]

Sounds more than fair to me--That's a pretty big job... 

[Mudman]

Very cheap.  I know another who had this problem too, 2007 f150.  HMMM?