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Engine/Transmission (1994 - 1998) too quick 2-3 shift

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Truck is listed as below... ATS Stage IV, starwheel turned, otherwise, pretty stock. I also have a DTT box that modifies the line pressure voltage that the computer sees. (It's adjustable)



Here's the deal... under all conditions except a manual shift, the 1-2 shift occurs like I suppose it should... maybe a little early for my taste, but managable. .



BUT, the 2-3 shift comes almost immediately after... within 1-2 seconds, even at WOT. if I manually shift it, I can run through second alot longer before the power dies and it should be shifted.



I called ATS, and Jeff asked me to unhook the reducer box, and see if it fixes it... While I will try this (though I dont agree with it at all), I'd like to check other things...



What kind of voltage *should* I be seeing in and out of the reducer? I'm thinking that the box may be reducing the voltage too far, and making it shift too soon?



When i called DTT, the woman I spoke with couldn't tell me what the voltage should be, and has e-mailed (to my home) the install instructions for the box...



I'd like to get input from the collective "we" of the TDR...



EDIT:

1-2 shift...

part throttle - 10-12

3/4 - 14

WOT - 18



2-3 shift...

part throttle - 15-17

3/4 - 23

WOT - 28
 
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