I have recently purchased a f-250 1986 with A 390 CARBED 4X4 with a EATON splitter switch on the gear shifter. it has a 4 speed in it. I looked under it and it has something I have NEVER SEEN BEFORE IN A MED DUTY TRUCK. I drive a big rig so I am familiar with Eaton splitters. but not ones attached on drivelines. I have contacted Eaton they were no help.....sold that dept to Dayna....???? the wires have come off and the unit doesn't seem to work. would love to find a wiring diagram for this unit so I can trouble shoot it and hopefully get it to shift.