Stock, the 6.5 diesel would have an NP4500 or a 4L80E automatic. Can't tell you how much work it'd be, but I suspect it'd be among the "easier" diesel swaps.
TEX
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G.U.M.B.O. Mud Racing
TEX
/wwwthreads_images/icons/wink.gif Got Mud?
G.U.M.B.O. Mud Racing