Differential bearings keep going bad in 99 gt - Ford Mustang Forum
 
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post #1 of 3 (permalink) Old 03-24-2014 Thread Starter
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Differential bearings keep going bad in 99 gt

When I first baught my mustang over 3 years ago one of the first things replaced were some noisy bearings in the rear end. It stayed quiet for a while but a year or two later it came back. We replaced them again when I installed my 4.10s but the noise returned a few months later. In a few days we are going back in to replace all the bearings including the axle bearings that are now making noise along with my stock clutches. This time Ford racing bearings will be used with carbon clutches.

Does anyone have any clues why my bearings keep going bad? It seems that the pinion bearing is the main culprit.

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post #2 of 3 (permalink) Old 03-24-2014
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My only thought is the preload is off. But generally you'll know that due to whining noise on either decel or accel - I forget which is which, but whining on decel would be indicative of too much, and on accel would be too little. Or vise-versa, cause like I said I'm a bit mixed up on that and don't have the exact info right in front of me.

There are also two methods or tq specs for tightening the pinion nut - 1st is to reinstall it with the exact same amount that it took to remove (assuming there were no prior related preload issues); 2nd is more of a "virgin" tq spec - it's in lb/in spec, if you have a Haynes manual then I'm sure you're familiar with it since you've already been through this a couple times.

But assuming no whining from incorrect preload, then I'm drawing blanks here.



2001 GT Convertible
/1967 Coupe
All the usual bolt-on's /200 I6, C4

And a few Explorers too... 2008 4.0 XLT 4x2, 1996 XLT 5.0 4x2, 2003 Sport Trac XLT 4.0 4x4
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post #3 of 3 (permalink) Old 03-24-2014 Thread Starter
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Yeah definitely no whining it's more of a rumble. I wouldn't think the pinion angle would be off with it in near stock form suspension wise. I have j&m lca's and soon will have "b" springs on but this happened long before either of those mods.

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