1985 Diplomat, 904 or whatever variant there of. Looking for a shift kit. Mancini says there isn’t one for the lockup. B&M says 10228, TransGo say TF-2 will work for LU or non LU. I need a firm answer, Will a shift kit work in a 904 LU or no? I’ve chased the threads to no avail. BTW, the converter says it’s a lockup. Step up tranny guys! Thanks!!