I we cut mine off about 1.5 inches, Sparks said he originally cut his MUCH shorter. The rod is the same diameter all the way down. We didn't rethread mine, just put a Momo AirLeather knob on it (which has a set screw), it took Shaun all of 5 minutes to have the shifter out of the car and on a table, about 10 minutes to take it apart on the table and regrease, using White Lithium Grease.
Any other questions?
-Chris