Abandoned History: The Chrysler UltraDrive Transmission (Part II)
The UltraDrive's debut version was prone to numerous types of failures because of fluids and sensors, build quality, parts, really everything. But engineers at Chrysler quickly massaged the A604 into the improved 41TE that was ready for use midway through the 1990 build year. UltraDrive was up and running within acceptable reliability standards per Chrysler. Clearly it was time to create more UltraDrive variations!
Source: thetruthaboutcars.com