Spudland Dave, if you ever get this built I'd like to see some pics. This is one of the problems I've been trying to solve since I got my 3320 cab. The rear SVC should be independent of the front without a diverter. I bought a sol. valve diverter for mine, but it still lays in the shed thinking someone else has had to have done this independent of a valve. Never understood what JD must have been thinking.