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I called Dave at Red Line, and he said that their D4 ATF was the way to go, so I drained it and filled it up with 2 quarts tonight. Thanks for the advice!

Hey Guys, I registered for this forum after lurking for years because I need some advice from people who know their lubricants! I have a 2004 F150 4x4 (New Body Style)and I'm changing the transfer case fluid at 67k. I know that the original fill was Mercon ATF, which seems to be no longer...