Hello all--hoping for some help on my 2001 super duty trans. OD lite flashing, code po715-'turbine shaft input speed' scantool shows erratic movement til a few mph, than drops 0 speed. yeah, that's gotta be sensor, I thought--wrong. new one same thing. gears all seem to be there, just shifts different. Is there a reading I can take @ sensor connector-[now I think of that lol]is there anything internal that can be involved? I changed fluid shortly before this happened, it seemed to act funny in reverse, since it turned cold] fluid was fine, no smell, real pretty,so probly my cold diesel engine was prob. Thanks for any help-& yes, this is what I haul my tractors with, but hasn't seen any heavy pulling at all.