Ramsey,
4wd you will reuse your transfer case, but the transfer case gear has to be swapped.
Will also need a shorter rear drive shaft and a longer front drive shaft.

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2005, FLT 4l65e, 2600 vigilante
Comp cam 220/220-.581/.581-115,
TVS 1900, Nelson SD tuned
13.9688 @ 97.05
burnout track video