Another way to look at things. A built 47rh is a heck of a transmission. The money spent to get the adapter and controller for the 4r100 would pay for half of a built 47rh and if you have to build the 4r100 than you are way ahead with the 47rh. So it is really up to you. The 12v is all mechanical and the 47rh does not need a computer to control it you just need pressure switches and some wiring to get od and TC lock up. For the trans mount I just welded a small plate to my 5R110 mount to change the bolt locations, works great. I had a 47re before (it was a used tranny that had been sitting for 3 years and blew all the seals the first time I drove it) and the drive shaft fits perfect you can get the dodge PCM to control that. The 47rh is about 5" longer than the 47re so you might have to cut your drive shaft. you do have to change out your input shaft in your t-case but getting the two halves of the case apart is the hardest thing with that. I just got my drive shaft cut down, and wont have time for a few weeks to install it but when I do I will let you know how it turns out. I used GOS singles for my motor mounts and their tach kit (Destroked Kit) and just got some adapters from Lowe's for the sending units. And hit my Check engine light with 3v and blew it out. Since I am in the process of doing a 12v/47rh in a SD if you have any questions I will do what I can to help you out. Just know it is the little things that can take the most time.