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Yes, you can put in a 6 speed. If considering it, try to find a 2001 or 2002 6 speed as they have the larger input shaft. Also something to consider is the New venture was bought out and 6 speed parts are scarce.
if i was going to swap a straight stick into a dodge truck it would be a 4500 with a big input and 5th gear fixed i know its off topic but thats just me