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2200rpm isn't going to hurt a thing. Just the pocketbook when it comes to fuel.

Dodge Cummins Diesel Forum Drop into the 2nd gen 12v forum and search for 47RH. Also look under the conversions forum for all the info you need.

How do you mean they're hard to find? I can help you lay hands on as many as you need. As to the wiring. Yes, the OD sector is enabled with a switch. There's also the TC lockup as well. That all can be handled with relays and switches on the throttle.

Leave it 4.56 with those 37's. The cummins doesn't mind revving. I've spun mine up 3800 countless times.

The 47RH has a .69 OD. So that with 4.56 gears and 37" tires nets a hair over 1700rpm at 60mph. Right in the sweet spot for power.

Don't bother with all this nonsense. Get a billet 47RH from a dodge and you're golden. No computer to screw with. And the 47RH can handle massive power with a triple disc converter, a good rebuild with billet shafts, and a good valve body. If you need any parts for it, feel free to reach out...