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I checked the NULON WEBSITE and the fluid does not meet FORD SPEC EST-M2C118-A.
https://www.motorcraft.com/us/en_us/...modifiers.html
https://www.nulon.com.au/products/ge...fferential-oil
IMO ...
... add the FORD LUBRICANT, do a series of tight turns in a parking lot and see what happens. If no relief, the clutch pack break-away value can be checked on a lift with a break-away value torque wrench.
Where did you find the clutch unit? FORD did not use until the 1959 model year.
There is no one-fits-all lubricant and 20,000 mile oil changes, despite what the manufacturer tells you.
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"Last Sunday, I caught him makin' eyes at Idell Bushey durin' preachin'. And I know what they do up there in the hills when they say they're possum huntin'. They're just sittin' around the campfire, drinkin' hard cider, hittin' each other on the shoulder and hollerin' 'flinch!'."
― Charlene Darling (Daughter of Briscoe Darling)