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I cut appx 1-1/4 inches off of a C6 shifter shaft, then threaded about an inch of what remained. I used a round screw-on ****, and the net result was a very nice shifter. The shaft diameter is on the large size for the C5 standard 9/16-18 threads, but it threaded just fine.
If you're not "married" to a particular threaded shift ****, you can modify the stock shifter to shorten the height by about an inch and shorten the throw to appx 3-5/8" to 3-3/4" without even removing the shifter from the car. I did this on a second C6 shifter by cutting appx 0.6" from the shifter shaft (using a hacksaw and plastic sheet to catch the cuttings). I then installed a round Momo ****. This type of **** attaches via three set screws around the base of the ****.
I cut appx 1-1/4 inches off of a C6 shifter shaft, then threaded about an inch of what remained. I used a round screw-on ****, and the net result was a very nice shifter. The shaft diameter is on the large size for the C5 standard 9/16-18 threads, but it threaded just fine.
If you're not "married" to a particular threaded shift ****, you can modify the stock shifter to shorten the height by about an inch and shorten the throw to appx 3-5/8" to 3-3/4" without even removing the shifter from the car. I did this on a second C6 shifter by cutting appx 0.6" from the shifter shaft (using a hacksaw and plastic sheet to catch the cuttings). I then installed a round Momo ****. This type of **** attaches via three set screws around the base of the ****.
Hope this info helps you out.
Here's a picture of the second shifter:
Looks - I'd do it, but I'm saving my money for a louder exhaust (aka, more cowbell).
I like the short height of your shifter. Do you now have a harder throw (More Effort?)
If I wanted to be scientific about it, I'd say that the shorter lever arm requires greater shifting force. The less than scientific answer, though, is that I don't really notice any increase in effort with the shortened shifter. The slightly shorter throw and the shorter **** height are noticeable, though.