I have a 2002 mustang gt with 137k on it with the tr3650 trans. The transmissions shifts well and the car has a clutch with about 5k on it now. It's just that I have tried pennzoil synchro mesh and mobile 1 syn atf per some of the mustang I just cannot get this transmission to smooth out some. It's a very notchy transmission. I currently have synchro mesh installed at 3qt 6oz like the mustang forum suggested. The car drives smooth on the way to work when it's cool out. But, driving home in phoenix The transmission gets difficult to shift as it warms up. What would you guys suggest?