Convert ultrashift plus to manual

I have a friend who I work with that has an ultrashift plus in a 1 year old Kenworth that he absolutely hates, to the point that he has broken down with anxiety over it. I am looking into what is involved in converting it back to a manual. I have the exact same truck as him engine, gearbox ect, except mine is a manual. Is it possible to convert the ultrashift to a manual or would it be easier to change the gearbox.

What needs to be changed, gearbox, clutch, clutch pedal and linkages, air lines, ecu parameters, bell housing. The tail shaft should be the same and the diff ratios are the same.

Has anyone done this?

It is past the point of them trying to fix the ultrashift he has had multiple custom programs written for it and it still won't do what he wants. He had an Allison before this and he wants it to be an Allison and it's not and he wants to put an Allison in it I just think it is too big a job just trying to get some info for him.

 

Thanks for the replies guys.
I had thought he would need to replace the gearbox as I had been told it can't be converted but just wanted to see if anyone had done it but I think just changing the box would be easier.
Would he have to rewire the speed sensors, as I would assume the truck would take its speed signal from the eaton ecu?

Also don't the ultrashift's use a single plate clutch? I know mine has a twin plate easy pedal in it and would the utrashift clutch bolt up the manual?

 

It is in a concrete truck and because we have to do a lot of low speed maneuvering and moving inches at a time he doesn't have enough control. Coupled to the ridiculously over sensitive throttle that these isle5 engines have, it is near impossible to drive for the job, and the thing is slow as, like I said same I have the same truck except for the ultrashift and I will pull 10 truck lengths on him from a standing start, loaded or empty. Also when you get it on a slight incline, I mean even empty at like 2-3% it will pick low low and won't change. Often you have to stop on flat ground get it to change into first then go again. Because the 9LL has a 60% reduction low low the truck can't make the shift from low low to first, you literally stop before the revs come down.
It has been reset by eaton about 10 times and had had multiple custom shift programs written for it and still no better.
For example loaded with exact same weights, we have this one hill going to a job with a set of lights half way up. I start in first and can shift all the way to 4th and change to 5th as I crest the hill. He gets stuck in low low all the way up, nothing will make the truck change not even manual mode.