I know people generally rave that the NAG1 is a great trans, and maybe it is for a Mercedes. But soft, slow shifts that Merc drivers may want are terrible for transmission life. On my 1996 ZJ, with nothing more than adjusting the TV cable and the hyd line pressure screw, it's still going strong with nice firm shifts 29 years later. I don't believe for one second the NAG1 is going to last that long without the clutches and bands being replaced. I'm sure it's a lot more complicated with these things being fully electronic now, but is there anything short of a valve body replacement that can make this thing shift quickly and firmly?

 

200k on mine. I used a flashpaq tuner.

 

Can you share a little more info? Not familiar with that tool.
How does it work and what settings did you change?

Thanks

 

https://a.co/d/5vNdrgs

Hope that link works. Tons of things to tune/change on your jeep with these. I'm sure there are better ones too. Different settings for the transmission are helpful to me. The one I run is "towing". Run it all the time. Good shift points and the best daily mileage. I'm running 35's and stock 3.73 gears though. So results will vary jeep to jeep.