Hey everybody, I'm back.

Hoping you wonderful people can help me figure out lubrication!

Looking to replace all the oil in my 1974 144 (b20, m40 w/o OD) transmission, final drive, steering gear, distributor, and engine.

My list:
Engine - 15w40 Rotella Diesel (zinc is good for these old B20's?)

Transmission - Gear Oil SAE 80 (per green book & owner's manual)

Steering Gear - Hypoid Oil SAE 80 (per green book)

Final Drive - American Military Standard MIL-L-2105 B SAE 90(per green book)

Distributor - Fill oil cup with engine oil (per green book), lube contact surface of cam with "cam grease" (per green book), lubricate ignition advance mechanism with 2 or 3 drops on the wick of the shaft with 10w engine oil (per green book)

My questions:

Transmission - I've read that 80w90 gear oil is good. The bottles that I picked up are Pennzoil and have "limited slip capability" (need more additive when 3%< treat level is required) and are GL-5. This is *not* going to work for my transmission correct? It's too slippery? Can anyone recommend a brand? I'm in the USA, PNW to be precise.

Steering Gear - Can I use the same oil that I use in the transmission? Any SAE80 gear oil without additives? Or does it have to be a bottle that says specifically hypoid SAE80?

Final Drive - Is there an easy way to tell if I have a limited slip differential? It's listed in the owner's manual and green book as an option but without much information. What MIL-L-2105 B SAE 90 equivalent should I be looking for?

Distributor - Since I'm going with the heavy, zinc-y, diesel oil that's recommended by enthusiasts, what engine oil should I use for the oil cup? The same straight 10w oil that I'll be putting on the wick of the ignition advance mechanism's shaft?

Thanks in advance!