Allison trans technician gurus... please help me out with this if you have any insight: I was driving my 1988 Executive 36' coach with a Cummins 'B' and an Allison AT545 pusher at approx 20mph when it inadvertantly went into reverse and ground to a halt in the middle of the road. The Transmission will not come out of reverse, but it will simultaneously engage in 1,2,3 and 4 forward gears. Of course, with both a forward and reverse gear engaged, the trans temperature wants to heat up pretty quickly. Here's my question: Is there anything in the transmission that can cause this problem other than a malfunctioning valve body? Please provide me with any insight you would like to share with me, thanks so much.