When I make the change...should it be a permanent part of that tune? When I changed it before, I used the 87 tow tune and changed the tire size to 2646. Then I changed it back to the #1 tune...and all was OK, If I go back to #2 will the 2646 tire size be there again?
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2006 F150 4x4 Lariat 5.4L Screw
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