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F5M3x TSB
In July, 1991 both Mitsubishi and Chrysler (who were selling badge-engineered Eagle Talon, Plymoth Laser and Dodge Stealth) issued a Technical Service Bulletin acknowleging an issue with shift quality and clashing (crunching) on the F5M21-F5M33 series manual transaxles.
According to Mitsubishi TSB 91-22-031 all transmissions built after 11 November, 1991 had modifications made to the 1-2 synchroniser hub and sleeve, the 1-2 synchroniser spring and the 3-4 synchroniser spring. Mitsubishi states that the improvements can be made to gearboxes made prior to 11/11/91 so long as the 1-2 synchroniser hub, sleeve and spring are changed at the same time. The 3-4 syncroniser spring can be changed by itself without affecting the rest of the 3-4 syncroniser assembly.
