1999 7.3 Super Duty
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Laughing Gas
Joined: Aug 2003
Posts: 836
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1999 7.3 Super Duty
I have 77K on my 1999 Super Duty. I bought the truck two years ago with just 23K on it. The truck sat for a while and was not used very much. I had the truck about a year and started hearing a howling coming from the rear diff. I took it into a shop and they (insert long story here) eventually replaced the carrier bearings which one was in very bad shape. I also had them replace the pinion and axle bearings. The ring and pinion were in good shape and did not need to be replaced. After picking the truck up there was still a little noise not very loud coming from the diff when at that point where your not under a load around 50mph. The shop said you may get a little noise because the ring and pinion may be running in a little differnet location? Plus being that I have a camper shell on it makes the noise seem louder than normal. I just let it go and have been living with it for about year but now it's really starting to anoy me. Is this a problem that is caused from setup of the ring and pinion and can it be corrected If I take it to a NEW shop?
Any Thoughts? Thanks
Any Thoughts? Thanks
Lead Driver
Joined: Nov 2007
Posts: 5,578
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When they put it back together and filled it did they put the additive in there that these rear ends require??? I believe they require a additive for the "limited slip" unit. If that wasn't put in there i would imagine it would make some noise.
Snowboard season cometh..
Joined: Jan 2006
Posts: 5,406
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From: Gulf Coast of Florida
Also about the additive, but if you're running Royal Purple synthetic fluid it's like Ragu, it's in there!!
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Laughing Gas
Joined: Aug 2003
Posts: 836
Likes: 9
The shop said they used a syntetic that was good to go with the Limited Slip differentials... After about 6 months I added the Ford LS additive. I dont think it made much difference. I think I will have to find a different differential shop in the Portland area than the one I went to. There just are not that many shops out where I live. Part of my long story was when I took the truck in complaining of diff noise they said it was the front wheel bearings 2 front wheel bearings and $700 dollars later plus a rental car for 3 days it was the rear carrier bearing?
