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Delayed shift between 1st and 2nd old tran and new Trans

dino1986dino1986 Member Posts: 1
edited December 2017 in GMC
2005 yukon xl put new Trans in because had a delayed shift between 1st and 2nd after new Trans being put in still does it I've changed throttle position sensor throttle body etc I'm out of answers hopefully someone. An help don't know what's left but the ECM

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    Mr_ShiftrightMr_Shiftright Member Posts: 64,481
    Where did you get the transmission? Is it under warranty? If from a reputable shop, they should be able to look for codes in the TCM and also pressure-test the unit.
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