I was talking to a Ford (dealer) guy the other day about Mercon V vs. Gear Oil. I told him I used Lucas to change the tranny fluid. He told me that I should have used Mercon V and that it was fine to use gear oil but come winter it would lock up. I live in the south for goodness sakes...

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'98 2x4 2.5L 5 speed xlt | Primer Black (for now)