Observations after the Antivenom shift mod, on a car with a Ripper shifter shortened 1 inch.
1. Car is noticeably easier to shift, but not "buttery" or "1 finger" smooth as some folks have reported. This is likely due to Ripper shifter, which is inherently stiffer than stock.
2. Forward-aft notchiness is a LOT less, but not eliminated.
3. Centering effort now seems higher, likely because it is unchanged and now is higher in proportion to the forward-aft effort. Revised centering springs may be the answer to achieve a better balance.
4. Shifter seems to have "play" in any gear position i.e. you can wobble it a bit. You would expect this, since the stock detent with the ball bearing tends to lock the shifter in position. The Antivenom plug has no such detent bearing. If you put a little pressure on it while in gear, you can feel the driveline vibrations. Also, you can easily slip the transmission out of gear by applying a little forward pressure on the stick when decelerating (especially in 4th gear). No biggy, since these are not things you do in normal driving.
5. It is now easier to select 4th when you wanted 6th gear, due to the decreased effort. I have "adjusted" my wrist accordingly.
6. No increase in driveline noise.
7. All in all, a good improvement. Others may achieve a similar result with the shimming experiment discussed in other threads.
Observations after installing Redline D4ATF (transmission had 24000 miles on factory fluid).
1. Slight improvement in smoothness after 30 miles. More miles may be required, although I'm not sure why.
2. No increase in driveline noise.
Hope this helps.
Jacob