fluid type for A-518

It was the no-bucks way to do it in 1966 too. That doesn't mean techniques/fluid haven't improved since then.

Run Type-F if you want. Pretty much the only fluid that Mopar never recommended for use in the 727.

Crank the line pressure up as far at it goes, not like it takes hoesepower to run the pump.

Chuck the accumulator spring (heck there's lots of springs in there, you can't really need them all. They were put there by the MAN to keep you down).

If you want the transmission the thump, bang, chirp the tires, break motor mounts and generally shift like crap, do the old school stuff and buy a cheap B&M kit. If you want a more durable transmission that produces quick yet relatively smooth shifts, get a Trans-go kit, follow the instructions, and use a modern high performance synthetic fluid like ATF+4.