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Flushed differential..now gear whine?

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Flushed differential..now gear whine?

Old 02-22-2009, 05:35 PM
  #1  
98GTstang
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Default Flushed differential..now gear whine?

I have Ford Racing 4.10 gears. Before i flushed the diff. they hardly whined at all. Now that its flushed, they whine like crazy when im slowing down until im completely stopped. I put 80w90 in it, along with a limited slip additive. Why would they start whining all of a sudden?? Thanks for the input.
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Old 02-22-2009, 06:08 PM
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Timspony
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...Maybe a bearing is on its way out?
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Old 02-22-2009, 06:47 PM
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ezking
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a proper install shouldnt have wined at all from the get go, unless they werent meshing properly.

i dont know what those additives do but you could have changed pressure between the gears by using a diff oil and that additive, further causing the gears not to mesh properly, and making the whine worse.
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Old 02-22-2009, 08:18 PM
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Fleet99GT
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When i did my 4.10's I never got a whine. Did you just use a pump through the back of your pumpkin or did you pull the cover and drain the fluid and inspect the condition of your gears. I just pulled my rear less than a week ago and was surprised that after 40k miles on the 4.10's and 86k on all the other gears there was no sign of wear on any of them. I've also used royal purple and i believe its 90w140. did you check to make sure u have enough fluid in there i believe it holds 2qts.
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Old 02-22-2009, 08:24 PM
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I'm a big fan of Royal Purple products as well. Plus they already contain LS additives. I'm pretty sure the 8.8 calls for a 75w140 gear oil.
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Old 02-22-2009, 08:27 PM
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excuse me i did use 75w140.
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Old 02-22-2009, 08:32 PM
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it calls for 80w140, but rp doesnt make 80 so i use 75
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Old 02-22-2009, 10:36 PM
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98GTstang
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Well the gears were installed by a professional mechanic..so i know thats not the problem.. the only thing i can think of, is we tightened the pinion seal because it had a small leak, so maybe we over tightened it..then again the fluid is a thinner weight. Im not going to worry about the whining right now, since i know its a common problem with after market gears.
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Old 02-22-2009, 10:43 PM
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99BlackPonyGT
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Originally Posted by 98GTstang View Post
Well the gears were installed by a professional mechanic..so i know thats not the problem.. the only thing i can think of, is we tightened the pinion seal because it had a small leak, so maybe we over tightened it..then again the fluid is a thinner weight. Im not going to worry about the whining right now, since i know its a common problem with after market gears.
even pros can mess up gears...its very common to get some whine no matter who installed it

little gear whine never killed nobody though
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Old 02-22-2009, 10:52 PM
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if the whine got worse after you tightened the pinion nut then thats your problem. the pinion nut sets pinion bearing preload by crushing a crush sleeve, you have now most likely exceeded the appropriate preload which is making your bearings scream. makes sense also because the pinion bearing will whine mostly during decel.
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