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OK - This one is driving me nuts. Once my 1929 A warms up and is put under a load like driving up a steep hill I hear a very loud sound like a 'spark snap' which seems in time with RPM. No loss of power. If I retard the spark almost to TDC the sound goes away. Under a light load if I move the...

I have a 1929 Ford Roadster and was wondering if anyone out there has tried Redline Heavy Duty Gear Lube for the transmission? They claim "Film thickness greater than an SAE 75W250, yet low fluid friction like 75W90" Any info is appreciated.