Transcommand
I threw my transcommand in the dumpster if that tells you anything about my opinion of it.
I could not tell one difference as far as firmness when I removed it and it actually cleared up some of the lagging shift issues I was having. Maybe unit was going bad? Don't know, don't care.
I just installed a Transgo "tugger" kit in my E40D and the shifts are much crisper now. It is designed for using exhaust brakes as well. No need to order a valve body, just get the kit and put it in yourself. Just make sure to get a separator plate to case gasket as well as a separator to control gasket or you'll be making emergency calls to all the local trans shops on sunday like I had to do. Not sure if they sell online but I got mine from Natpro for $99.
The Bauman TCS is the extreme electronic control mod or there was something called the "interceptor" that I need to go back and research. But, I would start with the hydraulic mod first.
My thought anyway,
Mike