Agreed... The transmissions that I do use some kind of kit on (most Chrysler trucks, some Fords) get a Superior. I also use a ton of Sonnax parts, but they're usually individual parts, not necessarily "kits".
Yes, I like the Superior kits in E40Ds too. I use numerous Sonnx parts as well. I think knowing NOT to use a Trans Go kit is what seperates a "Transmission Builder" from a guy, standing at a bench, building a transmission...LOL There's a huge difference between the 2. I always tell any potential customer, "Even if I don't end up building your transmission, please avoid any shop advertising that they use Trans Go kits." In many cases, Trans Go has to modify something in the exact opposite way than is beneficial. Their thoughts on accumulation is absurd!
Dynamic, you've been at this for a long time too. Do you remember when the Trans Go instructions for a 700R4 told you to put the trans in manual low with it up on the lift and pry in on the servo cover until smoke comes out the dipstick tube? They claimed this was "seating the band". No!... That's burning the band up!...LOL For those who don't know, this was applying the 2-4 band in manual low, when it's not supposed to be applied.
I've disproven everything that the TG kit for the 4L60E claims to help. The only 4L60E part they make that's worth a crap is their .500" steel boost valve.
Frank