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The dark color is no concern, because graphite is used in the friction plates, and this does stain the fluid quite dark.
Anything you'd describe as a metal flake, shard, or chunk would concern me if it were over about 1/16th". Did you see this metal because it stuck to the dip stick? it would be unusual I would think for the metal to stay on the stick.
The big concern on checking the level is making sure the fluid is at the correct temperature. The level reading is meaningless if the temperature is unknown. The temp is monitored using SDS, the sensor is built into the transmission conductor plate.
The reason the transmission fluid level is especially critical on the 722.6 is that the case is designed to scavenge the oil away from the internal parts to reduce drag. If it is overfilled it will greatly reduce the efficiency of the transmission.
This is a fairly critical job as far as the refilling especially, and also depending on the year you may want to drain the torque converter. At about the intro of the 2000 model year, the drain was eliminated from the torque converter, so it can't be drained, but if you have a 98 or 99 you should be able to drain the converter. And in case you haven't read this earlier, you need to use the fluid which is only available from the dealer (ATF for 722.6 transmission), or it may be available online also, like form fastlane.
Gilly
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