Once I decided to upgrade the World Class T-5 transmission, I investigated the companies that provide the gears, and chose G-Force, which resulted in a very pleasurable experience. They were more than willing to work me on information exchange as well as ensuring that I was happy with their product (enough of the promotion). Background first. The original WC T-5 worked flawlessly behind the 289. 289 was not a torque monster, but it was a 390 HP motor. The new 383 (stroked 351W) will provide a lot more torque, and I did NOT want to disassemble this car again (for a transmission failure) simply for a shortcut in not upgrading the transmission. Therefore, I needed to either go with a new TKO, a T-56, or an upgraded T-5. Option 1: The T-56 would have added another 50 lbs to the weight of the car (which I try to avoid this kind of situation like the plague), plus the needed changes to the transmission tunnel, bellhousing, and anything else I was not seeing. The torque rating on this transmission is better than the T-5, but not as good as the...