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Mark42 · 12-06-2009, 08:56 PM

The dark grey coating on the gears is phosphorus. I was under the impression that it was there to assist with load break in. But I'm not exactly sure what the purpose of the phosphorus coating is. It could be just for corrosion protection. Whatever its function, I read in many places that the gear oil should be drained after the first 500 miles to remove any metal partickes and the phosphorus coating that will wear off.

So I know the grey stuff is phosphorus, just unsure what its function is.

12-06-2009, 08:56 PM	#25
Mark42 Join Date: Oct 2009 Posts: 443 iTrader: (0)	The dark grey coating on the gears is phosphorus. I was under the impression that it was there to assist with load break in. But I'm not exactly sure what the purpose of the phosphorus coating is. It could be just for corrosion protection. Whatever its function, I read in many places that the gear oil should be drained after the first 500 miles to remove any metal partickes and the phosphorus coating that will wear off. So I know the grey stuff is phosphorus, just unsure what its function is. __________________ 1998 Firebird Coupe Mods: 3.73 Gears, Eaton TrueTrac, PCM Tune, LS1 Aluminum Drive Shaft, Cold Air Intake, 180 Thermostat, Magnaflow Cat-Back Exhaust, Moog LCA busings. My Firebird Projects : Click Here