yeah i know trent, but nothing matched across the board. i spoke with you, Justin Higgs, the dealership, looked on motorcaft.com, called Autozone, Advance, etc....
Dealer and motorcraft.com recommended the SP-412 which is a Nickel Plug. So had i took truck to dealer to get all this done, i would have gotten a nickel plug.
I spoke to Justin who recommended the double platinum plugs which are SP-440 (IIRC). He looked something up and said that the 4.0s came with one back of double plats, and one bank of single plats. but he had a hunch that Ford maybe started using nickel plugs to cut costs on the newer trucks like they cut costs on everything else post 06'.
I spoke with you and you originally looked it up on motorcraft and concluded the SP 412 Nickel. but then thought it might be SP-440 Double Platinum plug.
from motorcraft site:
I cross referenced it on Autolites site and their replacement for the nickel plug was a platinum plug
so it was all very confusing, nothing matched. it would have been easy had it been in owners manual plain as day. the only real way to confirm it is when i pull out my old plugs (if they have never been replaced in the 26k miles before i bought truck). if they are totally different, then ill go get some different ones.
I concluded i could probably be safe using a MotorCraft SP-412 (nickel), SP-489 (platinum), or SP-440 (double platinum)