Chaotic Z

Does anyone know the latest transmission revision for 2008 models? I've done quite a bit of searching and I can't figure it out. The dealer here gave me part # 320B0-JK41B, but zspeed shows JK41A as being the latest revision. I've been having some grinding issues for a couple of months now while going into 5th at high RPMs, coming out of reverse and a weird metal contact feeling going into 3rd. My Slave Cylinder went out this past Friday so I figured I would just get a new trans put in while getting the CSC and CMC changed.