I have the A518 installed and it works great everything is functioning as it should except now my speedometer is way off in overdrive. The 904 was working correctly with a 33 tooth gear and the 518 came with a 33 tooth gear but had the electronic adapter instead of a cable. The computer on the B350 van must have adjusted the speedometer gauge so my thinking is there is no way to make a mechanical speedometer work correctly when going into overdrive.
The big question is how to correct the gear so when running on the highway in OD the speedo gauge is correct.