Isn't that a know issue with the torque shift? Mine is 05 but has the same symtom if you don't come to a complete stop before going into reverse.
3661 - 2005 F-SUPER DUTY TORQSHIFT - REVERSE SHUDDER, LOSS OF REVERSE AND TRANSMISSION FLUID LEAKAGE
SOME 2005 F-SUPER DUTY VEHICLES WITH A TORQSHIFT TRANSMISSION (ALL GAS MODELS, AND 6.0L DIESELS BUILT BEFORE 12/13/2004) MAY EXHIBIT REVERSE SHUDDER, LOSS OF REVERSE AND TRANSMISSION FLUID LEAKAGE. THIS CONDITION MAY BE CAUSED BY THE REVERSE CLUTCH-TO-CASE SNAP RING BECOMING DISLODGED, RESULTING IN A HOLE IN THE REAR PASSENGER SIDE OF THE CASE. THIS CONDITION IS TYPICALLY ASSOCIATED WITH SNOW PLOW OPERATION. OVERHAUL PER WORKSHOP MANUAL USING A NON-PTO CASE (5C3Z-7005-AA) OR PTO CASE (5C3Z-7005-BA) AND INSTALL A NEW LOW/REV SNAP RING (DIESEL-ONLY 5C3Z-7D483-B; GAS-ONLY 5C3Z-7D483-D). TO PERFORM EFFECTIVE REPAIR, ORIENTATION AND PROPER INSTALLATION OF THE SNAP RING IS REQUIRED. USE INSTRUCTIONS POSTED UNDER 'WHAT'S NEW' ON THE PTS WEBSITE (US DEALERS),
WWW.INFORD.COM (CANADIAN DEALERS) OR
WWW.MOTORCRAFTSERVICE.COM (OTHERS).
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