Compression Ignition Addict
Join Date: Jul 2010
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My truck shifts to 4th around 37 MPH and the TC locks at 42 MPH, it then shifts to 5th around 55 MPH with it still locked up. I love the S1M tranny tune for my needs. It sounds like you do / did too?
I would start by reloading your tune and tranny tune and see if that helps. If you have not updated your Mini, now may be a good time as well. The .48 update seems to shift very smooth. I would also contact your tranny builder and double check to make sure they installed the correct stall TC. You may have requested stock, but who knows, maybe they made a mistake?
2010 Ford F-250 Super Duty, Lariet 4x4, Crew Cab Short Bed, loaded with every option...and more