Allright I have looked for the answer to this question and can't seem to find a definitive answer. I'm putting an Allison 6 speed GM 2007 in my ford it has the 261 manual Tcase and I'm going to use a medium duty TCM program, the TCM has two shift schedules I believe my question is if I engauge 4 low range in the Tcase which is around 2.73:1 will it shift correctly?