I see that there are many RV owners here with the Cummins/Allison combo. I don't have an RV question, but I hope Allisonman or someone here can help. I have a '93 Dodge W250 (4wd) that I've shoehorned a NV-5600 6-speed in. After a lot of trouble with clutch master/slave cylinders, I'd really like to put an Allison in it. My questions are the usual ones: Which models will work? Approximate cost? Will any of them mate to the NP205 transfer case or, if not, is there an adapter available? I could live without an overdrive, but I'd prefer to have one. Also, a lockup torque converter is a must. Any help would be very much appreciated. Mark C.