Question about the NV4500 conversion
 

I have been looking at the 47RE to NV4500 conversion across the web. I think I got it down for the most part but cant seem to find anything about driveshaft lengths for the 2wd conversion. I have seen people say theirs needed shortening or the length was ok and no need for modification. If anyone has done the conversion on a 2wd could you chime in.