I have to agree after market shifters to stock are like night and day. The newer tranny is likely smoother but teh shifter will make a big change.
I have a B&M Ripper with adjustable stops( I add the word stops) because I have seen rippers with no stops, I like it, but your choice is said to be even better.
I have heard that the T56 is a smoother (and quieter) operating transmission, but a Tri-Ax will give you such an improvement you'll feel like a schmuck for not doing it sooner.
IMO the T-56 is a considerable improvement over our trannys, BUT a tri-ax or Pro 5.0 will go a long way in helping to get a better feel out of the 3650's.
I like my triax. I might try to get a pro 5.0 handle for it, just to see what thats like. i like my friends Pro 5.0. Dont know if i like it better/worse than my triax
I've bought both - the Pro 5.0 for my 02 GT with the Tremec, and the Tri-Ax for my wife's 01 with the T-45. My preference - easily, the Pro 5.0. The throws are much shorter and much more precise, more race-car like than the Tri-Ax in the 01. The Tri-Ax is nice, but it is more like stock. Just my 2 cents...