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Old Mar 12, 2018 | 01:35 AM
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Default Diff whine
I removed the diff from the car to replace the pinion oil seal. Went ok all considering. Now under acceleration it sounds good, but when I lift my foot off the accelerator there is an audible whine coming from the diff. The pinion nut was torqued to 11in-lb. While out of the car the diff rotated smoothly and there was no excess play. Any suggestions?
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Old Mar 12, 2018 | 05:15 AM
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Did you count the number of turns to remove the nut? It should have gone back on the same number of turns.
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Old Mar 12, 2018 | 06:09 AM
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It's an 81 diff and read that the torque was more important than the turns. So the turns didn't quite line up under the torque, would have had to increase the torque.
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Old Mar 12, 2018 | 06:23 AM
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Originally Posted by talc
It's an 81 diff and read that the torque was more important than the turns. So the turns didn't quite line up under the torque, would have had to increase the torque.
Ok. Thought it was a "74 since that's what's in your profile.
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Old Mar 12, 2018 | 06:48 AM
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Actually it is a 74. So I brought a 74 seal and it didn't come close to fitting. Contacted the previous owner and he had put an 81 diff in it!!!
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Old Mar 12, 2018 | 07:15 AM
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Over run noise is a pain,
11 in lbs Does not sound right to me, however you have a noise and that’s telling you something is wrong, you need to check the patterns drive and over run.
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Old Mar 12, 2018 | 12:36 PM
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i believe the torq rating is to turn the whole yoke not the nut.
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Old Mar 12, 2018 | 07:29 PM
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the diff casing is aluminium and there are some minor modifications, though a little questionable. So if my torque setting is to turn the yokes what is the torque for the spline nut?
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Old Mar 12, 2018 | 07:32 PM
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Originally Posted by talc
the diff casing is aluminium and there are some minor modifications, though a little questionable. So if my torque setting is to turn the yokes what is the torque for the spline nut?
none.
the idea is the yoke presses and a crush sleeve which
presses the tapered bearing which needs a load
measured by turning resistance.
the nut is used to load the tapered bearing to the turning resistance.
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Old Mar 12, 2018 | 08:12 PM
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Originally Posted by calwldlife
none.
the idea is the yoke presses and a crush sleeve which
presses the tapered bearing which needs a load
measured by turning resistance.
the nut is used to load the tapered bearing to the turning resistance.
The 80-82 diff use shims not a crush sleave, as long as the shims are still there it's fine. The nut still needs to go back to around the same position. (Not as critical as the older iron diffs) and turning torque checked.
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Old Mar 12, 2018 | 08:20 PM
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Originally Posted by Antz81
The 80-82 diff use shims not a crush sleave, as long as the shims are still there it's fine. The nut still needs to go back to around the same position. (Not as critical as the older iron diffs) and turning torque checked.
good to know.
turning torx preload is the thing.
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