Why do “bump shifts”, or very hard down shifts occur in Chrysler, Jeep and Dodge automatic transmissions if the proper mechanical procedures are not performed following service work? Rough shifting can occur immediately following work such as 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. Apparently this is due to the technician failing to reprogram the transmission control module (TCM) flash memory following automatic transmission work. Not having the TCM flash memory reprogrammed (flashed) or the Quick Learn procedure performed after servicing any Chrysler, Jeep or Dodge automatic transmissions from the year 1992 to present, can result in the shifting issue. AMSOIL has just released this Technical Service Bulletin with the subject line: Erratic shifting problems in Chrysler automatic transmissions occurring immediately after changing transmission fluid. AMSOIL produced this bulletin so that customers are educated on this issue and to make it clear that this is a Chrysler issue and not an AMSOIL ATF issue.
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