I also have a Steeda Tri Ax shifter and I love it to say the least.
Any aftermarket shifter is better than the stock one and that should
be your first mod.
werd. shifters dont wear. though like stated above, try to opt out for a MGW. I have the TriAx in my GT and the MGW in my cobra and i dig the mgw better, its adjustable arm lets me put the knob in a comfortable position. feels smoother, but that could very well just be the tranny itself, alot of trannies shift smoother than a 3650.
I have had both the MGW and the Triax and liked the MGW better. Its a bit quieter but what I liked the most was that the handle has 360* of adjustment to get it in just the right spot.