Just need to know the specs for fluids (oil & gear) on my 2010' Dyna FXD

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You are going to need a service manual, it is too long a process to go into right here. Use Harley type E fork oil

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Use Formula Plus or SYN3 in trans and primary and engine. Or HD 360 20W50 in engine. Try to stick to same oil brand all the time in engine.

Hi, Jjcarney for this scenario you will need your service manual that has all fastener torque specs -fluid capacities and a wiring diagram on the back pages, parts fiche, and owners manual if you can not find the best tool you ever bought for your Harley, despair not, for a mere zero $0 you can download another one.
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On the '02 bikes, the engine, primary, and transmission came with Harley-Davidson SYN3 synthetic oil in all three areas. Three quarts of engine oil, 32-36 ounces in the primary, and 20-24 ounces in the transmission.

The SYN3 oil is a synthetic 20-50 weight oil with a "C" rating on it. Check the API code. It will say something like SJ-CG. The "Cx" is what you're looking for as this tells you that it has the high pressure additives in the oil for use in diesel engines. Harley has always recommended using "C" rated oils in their engines.

Two are the engine oil one is probably the tranny fluid.

Lookin from the primary side u'll see a hex bolt that sits vertical near the bottom of the pan , thats your main oil drain plug