[jwd]

With the exception of the GM Saginaw 4 speed, the T-10 is the weakest 4 speed on the planet. If you have decent power and a little bit of traction, the main shaft will twist just ahead of the yolk. I've rebuilt many of them and would conservatively say that 90% had twisted main shafts. Another weak point are the synchros. Unless you rebuild them using Torque-Lok sliders, you're guaranteed they will jump out of gear on deceleration. They are okay for a cruiser but I wouldn't put one in anything I planned on "driving hard".