Hey folks. I thought I would continue the thread from the general section over here as it has become less of a tech question and more of a build. A quick recap up to this point. I picked up a broken 6R80 locally to do some fitment testing and start designing a pattern for an adapter from the 4.0 Jeep engine to the Ford 6R80 transmission. As far as I can tell there has not been a 6R80 behind a 4.0l as of yet. If there has and anyone has any info it would be most appreciated. I also ordered a low mileage unit off eBay and thought it would be weeks before receiving it but, it showed up three days later. So I now have 2 transmissions and 2 torque convertors. I also picked up a flywheel from a 32rh as I will probably incorporate that into the adapter process. I will probably also need to mount a crank sensor into the adapter as well as I will need it to operate the tach, and for emissions. I have had an Atlas transfer case on order since May and have already spoken with them and changed the Atlas to have the 6R80 input shaft and adapter. Length is the really concerning issue. I measured my current NV3550 at 24.5" long from bellhousing flange to transfer case flange. The 6R80 is 23.75" from flange to flange, but has to have a 3.625" long adapter from the 6R80 to the Atlas. Not to mention the .5-1.0" adapter plate between the 4.0 and the 6R80.