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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.