This work on 3rd Gen? I have a very similar issue with my 2004. Doesn't want to go into 3rd, then does, and quickly goes right into OD.
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2004 "305/555" - 2500 Quad 4x4 48RE Short Bed -- StarBoards Running Boards, PML Trans Pan, Amsoil Dropin Air Filter, Prodigy Brake Controller, Timbren SES, 16k Superglide 5th hitch, line-x