Join Date: Mar 2006
Location: Ludlow, MA
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As Skrap said, the driveshaft needs to be modified, the existing bushing needs to be shortened, depending on whether you get a VL1400 or VL1500 drive you may need an axle bushing to downsize the hole as well.
Then yes, drill the existing holes to 9/16" or elongate them.
Corey on this site sells drop in ready units that are already modified and have all the bushings. You just have to open the holes up and drop it in.