Looking for information on transmission swap from Crf450x to Cr500. Breaking down the part numbers for the main shaft, counter shaft and some gears they are the same. My biggest concern is shaft lengths of the Crf450x. Does anyone have or no a source that shows the lengths. I was a Honda tech for many years and I know that Honda would change the number a little bit, but same part that was revised. Any information would be appreciated. Helping my son with his Senior project.