Thanks for all the info, contacted Wilcap and Wayfarer, will see what options I have and post some answers.
One thing for sure I will need to replace the ring and pinion to something more realistic. My current ratio is 4.89 or higher. Its a 9-5/8" ring and it looks like my only option will be a 4.30 ring from Vintage Power Wagons. Unless there is any suggestions for another source or third member. Most don't know this but the Routevan has a IRS , Dodge Brothers Style. This is a pic of the last Route Van chassis that i restored in 2014