I recently helped my good friend out with replacing his 8hp45z in his X5 Xdrive35i. Although after we got it all back together and filled the transmission with the proper fill procedure, the trans does not shift. Almost as if the shift isn't communicating with the transmission itself, the shifter does flash no error codes in either xhp or mhd. Any tips would be appreciated . Also, The previous trans was removed due to it no longer engaging park and making some concerning clunks.