Ok I think I have a gsr tranny. When Im at 130 km/h, I think thats about 80, I'm at 4100 rpm. I'll have to check for that LSD. I'm not sure what LSD is. I do need a good set of tires. What Rpm is it safe to cruise long distances with. I don't want to damage this awsome engine. I know sombody pumped some money into it. This car was taken by the police because the owner was driving without a license. My gain One more thing this car has a tube sticking out of the trany with a cap on it. Is that stock on gsr's?