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I have never known a wheel bearing to make a high pitched sound. Usually when wheel bearings go out, its a grinding metallic sound, not low pitch, but not high either.
1995 Pontiac Firebird
2008 Chevrolet Silverado LT Crew Cab 4x4
I have never known a wheel bearing to make a high pitched sound. Usually when wheel bearings go out, its a grinding metallic sound, not low pitch, but not high either.
That's why I was trying to think of something other than it...but I've actually heard a couple bearings that kinda had a whiney drone to em, but you're right, it sounds more grindy than what hes describing...
Hmm... let me clarify when I had the differential service. He did say the fluid was "dirty" when he changed it, but then again, I've never changed it before then. Wonder if something is effin' up back there.
Hmm... let me clarify when I had the differential service. He did say the fluid was "dirty" when he changed it, but then again, I've never changed it before then. Wonder if something is effin' up back there.
Unless you're losing fluid back there, or there was none to begin with, that might make the whine you describe. You probably need someone in the car to point it out to you.
1995 Pontiac Firebird
2008 Chevrolet Silverado LT Crew Cab 4x4
Unless you're losing fluid back there, or there was none to begin with, that might make the whine you describe. You probably need someone in the car to point it out to you.
Ok, the more I listen to it, it seems to almost have a low, grinding sound that gradually raises in pitch until it becomes a low whine at about 35MPH. At 75MPH, it's high pitched.
So, if the diffy is whining, what is usually involved in that repair?
Well it's usually one of two things:
either the pinion nut is starting to back off, in which case a qualified specialist will open the differential, and tighten it, or the bearings are going bad, and let's just put it this way...you want the first thing, and not the second. Lol.
You might want to check to see if the diff was over filled. When you pull the check plug out of the side of the housing it should just trickle out. You also might want to check your invoice from the service and make sure he didnt put synthetic GL5 in it. It takes conventional GL5 w/ friction modifier additive.
You might want to check to see if the diff was over filled. When you pull the check plug out of the side of the housing it should just trickle out. You also might want to check your invoice from the service and make sure he didnt put synthetic GL5 in it. It takes conventional GL5 w/ friction modifier additive.
I thought that had been extensively researched and it was found that you did not need the friction modifier, nor conventional lubricant for any 98 - 02 open rear end or Zexel-Torsen Posi....the Pre - 98 Auburn LSD's I thought were a different story though and required both of those because of the presence of clutches in the differential.
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