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Old 03-17-2013, 06:47 PM
kbalz kbalz is offline
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rear end clutch plates going ?

2000 f150 182000 makes a rumbling noise from rear end mainly when turning at slow speeds. Thought it might of been axle bearings so replaced them this weekend to no avail. I have the 9.75 limited slip rear end but what i found out this weekend is that the axle bearings are for 8.8 , the 9.75 bearings was to big. So does this mean I have 9.75 ring gear with 8.8 axles ? I have been using royal purple 75-140 with no friction modifier because royal purple says its it there. But after doing some research Im going to go get some friction modifier and see if it helps . So my question is how much of a pain is it to replace the clutch packs? what if i wanted to just put a different differential in and do away with limited slip ? Or go with a different aftermarket limited slip diff. ? what are my options , etc. Thank you in advance.
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Old 03-17-2013, 08:00 PM
Bluegrass 7 Bluegrass 7 is online now
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The clutch plates would lock up too hard from lack of friction reducing additive.
If you have no reaction driving relitively straight but an inside wheel spraggs in a sharp turn causing a rough feeling, it's the clutch paks.
You would need to put additive 'in' to reduce the clutch friction.
A way to test the clutches is to jack one wheel off, trans in neutral, front wheels blocked, and apply a torque to a lug nut.
Check to see how much force is needed to make the clutch Pak slip.
Do this for each side seperately.
If a torque wrench is used for testing, you should see about 40 to 60 lb/ft+/- before the Clutch pak slips.
If much more, some additive is needed. Much less, suspect the clutch paks of being worn.
Good luck.
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Old 03-17-2013, 08:20 PM
kbalz kbalz is offline
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thank you bluegrass I will give this test a try tomorrow. It does make the chatter / rumbling when I'm turning . Doesnt do it everytime but usually that is when it makes that sound. Looking at my local parts stores online and the only kind of additive they sell are k&w ,lubeguard , or champions brand. Can I get the xl-3 from ford dealership ?
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Old 03-17-2013, 09:51 PM
Bluegrass 7 Bluegrass 7 is online now
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Bluegrass 7 has a good reputation on FTE.Bluegrass 7 has a good reputation on FTE.
At Ford, should be able to.
Any other brand, read the label to be sure what your buying is for the application.
.
This is one of those rare times when the rear fluid is not 'slippery' enough and needs 'friction modifier' to make it so. So much for Royal Purple!
Good luck..
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Old 03-17-2013, 10:11 PM
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steve(ill) steve(ill) is offline
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Auto Zone sells a 7 oz bottle for $10.
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Old 03-17-2013, 10:11 PM
 
 
 
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