I was doing a search around the forums to try and get an idea of what spark plugs to use on a turbo'd 420a, but didn't find many opinions.

I figure it'll be a single-prong plug, but specifically what types are suggested to use on a turbod 420a?

Also, my auto tranny was switched to a 5-speed. I have heard these manual trannys are "picky" so that one should use factory tranny fluid. Do you guys typically agree with this comment or do you use other brands without incident?

Thanks so much for your thoughts.

Plugs - NKG's are one of the best, some like Champion I think. Use factory heat (6) up to maybe 10psi or so, or if you don't boost much at all. Do a lot of hard-driving/high boost go with a colder plug (7's usually) as needed.

Trans fluid, see the sticky in the MTX section. I know I've tried maaany different kinda, but it still seems the smoothest with factory fluid. I believe mopar ATF4 is the current equivalent at general stores.