Flushed differential..now gear whine?
02-22-2009, 04:35 PM
#1
2nd Gear Member
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Join Date: Aug 2004
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Posts: 474
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.
02-22-2009, 05:47 PM
#3
1st Gear Member
Join Date: Dec 2007
Location: Washington
Posts: 112
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.
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.
02-22-2009, 07:18 PM
#4
1st Gear Member
Join Date: May 2008
Location: Maryland
Posts: 116
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.
02-22-2009, 09:36 PM
#8
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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.
02-22-2009, 09:43 PM
#9
aka 'Negative Nancy'
Join Date: Jul 2007
Location: Ohio
Posts: 4,839
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.
little gear whine never killed nobody though
02-22-2009, 09:52 PM
#10
5th Gear Member
Join Date: Jul 2007
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Posts: 2,363
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.