I don't know. Begining of May my car had 7000 miles(sat all winter), now i have 9400. These last 2400 miles i have beat the he!! out of the car. I don't understand it but the car is running better than ever.
I have 1-2 grind-clunk, I live in North East Pennsylvania. Shifts really well when warm. Seems to shift even better when i really wind the motor out.
I also have a UPR shifter.