This is a disassembly or a tear down of a 6L90 automatic transmission for a no movement condition in forward as well as reverse range. While no movement can come from a check ball it is highly unlikely that two check balls will stick in the separator plate simultaneously. I have seen this failure before but it has only been on 4x4 2500HD work truck pick ups.
#AutomaticTransmission #Chevrolet #6L80 #GMC #Ford #Transmission #Milwaukee #