Inform AMSOIL customers of problems inherent to Chrysler automatic transmission performance if proper mechanical procedures are not performed following automatic transmission services, and provide Chrysler recommendations for preventing and correcting these problems.
ISSUES: Bump shifts, or very hard down shifts, will occur in Chrysler, Jeep and Dodge automatic transmissions if the proper mechan- ical procedures are not performed following service work. This includes, but is not limited to, transaxle replacement, transmission control module (TCM) replacement, solenoid replacement, clutch plate and/or seal replacement, valve body replacement or repair, and oil and filter changes.
TECHNICAL DISCUSSION: Chrysler, Jeep and Dodge have issued TSB 18-020-02, TSB 18-037-05, TSB 21-005-03 REV.A and TSB 21-006-03 REV.A to explain the issue in detail, as well as the necessary procedure to prevent and correct the problem. Chrysler, Jeep and Dodge owners who service their automatic transmissions are advised to have the transmission control module flash memory restored to OEM standards following completion of the service work. This type of service must be completed by a Chrysler, Jeep or Dodge dealership or qualified service department trained in Chrysler, Jeep and Dodge applications.
RECOMMENDATION: AMSOIL INC. has determined that the problem with hard shifting evident immediately after servicing Chrysler automatic transmissions with AMSOIL ATF is due to the transmission control module record of the mechanical service. Failure to reprogram the TCM flash memory following automatic transmission services will result in the outlined performance issue.
download: http://www.syntheticmotorsports.org/Chrysler_Erratic_Shifting.pdf
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