Alcan KobRa Posted June 19, 2014 Report Share Posted June 19, 2014 I've noticed a whining noise coming from the rear end of my 08 during a slow turn or when backing up. I've heard some guys with standard GT500s complain of this after a rear end gear change. Is this normal for the 3.37? Thanks. Link to comment Share on other sites More sharing options...
yosemiddysam Posted June 19, 2014 Report Share Posted June 19, 2014 The excuse that was given to me was that it is a Carbon Fiber Clutch Pack inside the rear end that makes that noise during turns and it is normal on the 2012's. Link to comment Share on other sites More sharing options...
KR09 Posted June 19, 2014 Report Share Posted June 19, 2014 Doesn't sound normal to me, I would have noticed a whining noise in my KR. Link to comment Share on other sites More sharing options...
shelbypt Posted June 25, 2014 Report Share Posted June 25, 2014 While driving, my rear makes a faint whining sound, but I don't hear it when backing up or turning. Link to comment Share on other sites More sharing options...
FiaCobra Posted July 2, 2014 Report Share Posted July 2, 2014 While driving, my rear makes a faint whining sound, but I don't hear it when backing up or turning. Same. I only hear it on certain roads though. Link to comment Share on other sites More sharing options...
Mustangcollector Posted July 3, 2014 Report Share Posted July 3, 2014 I've never noticed anything on my KR. Link to comment Share on other sites More sharing options...
oldlugs Posted July 3, 2014 Report Share Posted July 3, 2014 I've noticed a whining noise coming from the rear end of my 08 during a slow turn or when backing up. I've heard some guys with standard GT500s complain of this after a rear end gear change. Is this normal for the 3.37? Thanks. YES, it is normal (but not when backing up straight). I believe that you're talking more about a "groan" (dying whale sound) than a a'whine", though most of our KRs are likely to have a slight gear whine as well. The whine is noticeable mostly around 65 MPH. This is why Ford installed the vibration damping weights on the axle. BUT, the "groan" will be heard when turning tight turns at low speeds. It will do it after you've gotten on the car (put your foot in it) and shifted hard. Cause is from the diff clutch pack being jammed together. The groan will go away again after the car is driven normally (gently) again for a short time. I've read that gently diving tight "figure 8s" in a parking lot will help loosen up the clutches, too. Some people even recommend adding friction modifyer to the diff oil, but I wouldn't, as it just makes the clutches slip more... My .02. There's lots that has been doccumented online about this groan with the carbon fiber diff clutches, and it is nothing to worry about. Learn to love those sounds... Both my KR and my '08 Bullitt will make that groaning sound after I've gotten on the car, and with both, it goes away again after gentle driving. Both the '08-'09 Bullitt and '08-'09 KR used the exact same rear end. Link to comment Share on other sites More sharing options...
Alcan KobRa Posted July 4, 2014 Author Report Share Posted July 4, 2014 Thanks OL, I was sure it had to be something like that. I alway back my car down the driveway after a drive and I hear it when I'm doing slow turns in a parking lot. Perhaps I'll try the figure eight method. AK. Link to comment Share on other sites More sharing options...
FiaCobra Posted July 6, 2014 Report Share Posted July 6, 2014 Well, I uninstalled those axle weights. Car is 9lbs lighter....lol Link to comment Share on other sites More sharing options...
oldlugs Posted July 6, 2014 Report Share Posted July 6, 2014 Well, I uninstalled those axle weights. Car is 9lbs lighter....lol That was the first thing I did when I got the KR. Probably increased the gear whine just slightly, but I didn't want those hanging there. Link to comment Share on other sites More sharing options...
thewheelman Posted July 7, 2014 Report Share Posted July 7, 2014 A change of rear gear lubricant and addition of a $4 bottle of friction modifier did away with my "groaning" rear end.....actually, it was the car's rear end groaning........I think it's pretty common amongst the 500's....... Link to comment Share on other sites More sharing options...
shelbypt Posted July 9, 2014 Report Share Posted July 9, 2014 Yeah, I took those weights off too. That's funny, because I could have sworn that I didn't hear the whine earlier on. Makes sense now... Thanks Link to comment Share on other sites More sharing options...
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