The English BW35's tend to crack the diaphragm spring around the forward clutch apply piston. That makes a lot of metal and takes out the trans. Also the torque convertors are a poor design, and have way too low a stall speed. The vanes come loose too, and cause a great deal of slippage. The Japanese improved every aspect of the Borg Warner design, and then said the hell with it and designed their own transmissions which are among the longest lasting in the industry.