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Cummins to Allison transmission adapter kits by G Force. Choose from the Cummins to Allison Adapter Plate and Flexplate Kit for the 2003-2017 Cummins 6BT - Common Rail engine, bolting to a GM Allison 1000 series automatic transmission, for model years 2001-2007, the 1989-2002 Cummins to Allison conversion kit for the diesel Cummins 6BT, or 5.9L engines bolting to an GM Allison 1000 automatic transmission.