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Hi new here .. got a 2000 f-350 7.3 had no tranny in it when I bought it. Has ts6 tuner but only 3 Positions work on a 4 position knob? has shifted hard into 2nd and 3rd since I put in rebuilt 4r100 tranny.its the worst when first taking off from a start up ..1rst gear seems to drag out longer than I think it should going high into rpms before shifting to second .. if I lift off throttle it ####s sooner . now after 6k it stoped shifting into 2nd gear at all and just redlines .. I can shift it into 2nd gear manually with shifter .. trying to Diagnose any help will be appreciated
 

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Former Ford Trans Engr.
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3,086 Posts
Get the codes read. Without the codes, all anyone can do is guess.
 
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