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On Fords, you can tell a big difference in shift points, both up and down.
My 450 will shift into OD quickly loaded or unloaded; with the Tow/Haul, it will delay the final upshift sometimes to the point I have to kick it out to get into OD.
For me, it is only useful in hills and mountains.
Joe
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2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired
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