As many Toyota and Jeep owners know, the AW4 / Toyota 340, A340, and A341E series of transmissions are generally very well made and demonstrate excellent durability in unmodified applications. The framework is present for an extremely strong transmission that is to be used in a high performance or extreme duty application.
The problem is that the original calibration is engineered for driver comfort rather than ultimate component strength. The soft, sliding shifts that a…