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can anyone help me figure this out

ive got a 2008 f250 6.4L 4x4 8 inch lift and a spartan tuner.. my transmission went out so i rebuilt it the it worked fine and the tft went to-68 so i replaced it and i noticed the truck wasnt running like normal the a few miles later it reved up and wouldnt go anywhere so i put it in park and killed it and started it up and put it in reverse it started going forward my reverse is gone and it will go forward in every gear but park you can start the truck in neatural and it will take off any ideals on what could be the problem thanks for your time
 

blacksnapon

Moderator
Staff member
Disconnect your tuner and see what happens.
 

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