Noise In Rear
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Noise In Rear
I have a 2002 F-350 dual rear wheel pick-up. The truck has about 128,000 miles and runs great,but recently I have noticed a slight growl comming from the rear axle. I jacked the truck up, put it on jack stands and put it in Drive and even at idle with no weight on the axle you can still hear the noise. Its not loud but noticable. It doesn't sound like a bad rear diffrential which is more, in my experiance, load sensitive to acceleration or decelleration. The Growl has a rhythmic sound and sort of pulsates as the wheels go around. The sound becomes noticable driveing around 20 MPH and gets alittle more noticible up to about 45 MPH, but dosen't seem to get louder after thatl, it actually seems quieter the faster you go. I used a stetho-scope to try to locat the noise but I could not tell if it was in the rear differential, pinion area or axle bearing locations. The sound can be heard from all the rear axle locations. I also listened at the carrier bearing in the driveshaft, which was not noisey at all. I was thinking maybe the carrier bearings??? Does anybody have any ideas as to where it may be comming from?????? Thanks Bob
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From: USA
What maitenance has been done to the rear diff ? fluid change?grease rear axle bearings ,even though its a full floating axle they still need greased now an then.
any weeping at the pinion shaft seal?
Do you have excessive backlash in the gear set?
Rich
any weeping at the pinion shaft seal?
Do you have excessive backlash in the gear set?
Rich
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The Gear oil has been changed at about 40,000 miles and again at 110,000 miles. The pinion seal was replaced at about 50,000 miles. The right rear axle seal was also replaced at 110,000 miles. There was no signs of metal in the oil either time the gear oil was changed with no excess metal on the magnet. There is no excessive movement in the pinion shaft and the back-lash seems to be about right. Thanks for the responce. Bob
Tuned
Joined: Jun 2005
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If you are hearing a high pich whinne it's most likely a pinnon bearing This is the problem I having now but the only good thing is the shop that regeared my diffrential is covered buy the shop but the shop is going to put new bearings and gear set in for me Monday.
Is you'r nosie on drive or coast or when you turn cornners if you go to the diffrential web sites like west cost gears, drivetran gears ect, they give you some clues what may be wrong with you rear end what to look for and what kind of sounds diffrent part of the diffrential makes when it's going bad diffrential bearings make diffrent sounds.
When you changed gear oil what type and weight did you put in it is it posi ect.
Is you'r nosie on drive or coast or when you turn cornners if you go to the diffrential web sites like west cost gears, drivetran gears ect, they give you some clues what may be wrong with you rear end what to look for and what kind of sounds diffrent part of the diffrential makes when it's going bad diffrential bearings make diffrent sounds.
When you changed gear oil what type and weight did you put in it is it posi ect.
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Originally Posted by FortyFords
What maitenance has been done to the rear diff ? fluid change?grease rear axle bearings ,even though its a full floating axle they still need greased now an then.
any weeping at the pinion shaft seal?
Do you have excessive backlash in the gear set?
Rich
any weeping at the pinion shaft seal?
Do you have excessive backlash in the gear set?
Rich
How do you grease the axle and where? Thanks
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Post Fiend
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From: USA
The axles have to be pulled . and you repack like in the old days on front wheel bearings. this only on our full floating axles.
Rich
Rich
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Tuned
Joined: Jun 2005
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Diff Oil
I do think mizzitch is right on the diff oil lubes the axle bearings.
When wheels bearing go bad you can hear them when you turn go to a big parking lot and do some circles left and right turns and listen for clicks or grones sounds look at the innner rim for oil leaks.
Good Luck
When wheels bearing go bad you can hear them when you turn go to a big parking lot and do some circles left and right turns and listen for clicks or grones sounds look at the innner rim for oil leaks.
Good Luck
Originally Posted by mizzitch
so when is this recomended? I was under the impression that the diff lube when all the way out to the wheel bearings on these - obviously never had the rear end apart.
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Just an update on my differential noise! I stoped by the local Ford dealership and spoke to the service manager about the noise, so he took a ride with me, to see if he could pinpoint the noise, but no luck. He did say he thought the carrier bearings were a good possibility. I then called one of the techs. at West Coast Differential as marv02 suggested and he also thought my noise is probably comming from a worn carrier bearing. I told him I was going to remove the axles and run the truck on jack stands again, just to make sure the noise isn't comming from the wheel bearings. After the axle procedure, assuming the noise is still there, I will remove the carrier from the rear and check the bearings visually for defects. I will keep anyone interested posted as to the outcome. Thanks For The Help Bob
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From: Home Base Nebraska
Originally Posted by FortyFords
The axles have to be pulled . and you repack like in the old days on front wheel bearings. this only on our full floating axles.
Rich
Rich
jayco20002000 your problem sounds like a bad carrier bearing of maybe even just a dry slip joint at the carrier bearing. Pull the drive shaft and check it and at the same time check the U joints.
Denny