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Originally Posted by chicane
What fluid are you running ?? And... which friction modifer are you using ??
I doubt you are going to be able to run the diff without using the friction modifier... unless the lube you use has it added to the base oil itself. Then again... you may just need to add a little more fric mod to subdue your issue.
Most differentials need 4oz of fric mod... but if the clutches were not soaked in fric mod to begin with (at the time of differential assembly) it will need time to mix with the base oil for it to do its job.
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I can't remember the weight of the oil - I looked up what would go into any stock Ford 9" application (oil weight wise). I added the fluid modifier that you can buy at the local auto parts stores. This has been an ongoing problem for a couple of years, but I have been driving the car everyday to keep miles off my new truck and it is driving me crazy!