A/T - Slipping/Premature Clutch Wear: Overview
Number 84-7-35 Date 8/84Subject: BURNED OVERRUN CLUTCH, FORWARD CLUTCH, 3-4 CLUTCH PLATE ASSEMBLIES
Beginning April 16, 1984, (Julian Date 107) a new input housing and shaft assembly and oil pump assembly went into production for all models of the THM 700-R4 transmission. In addition, new torque converters went into production for all 298 mm applications (4.1L in/line L6; V-8 gas and diesel engines)..
Figure 1:
All transmissions built starting with Julian date 107 are stamped with the letter "T" on the pan rail after the transmission identification number (fig. 1). The letter "T" will only be used for the remainder of the 1984 model year.
These production changes eliminate the possibility of burned clutch packs in the input housing which may be due to hairline cracks which could develop across the ring grooves in the turbine shaft. A crack in this area of the turbine shaft on models built prior to this change may cause one or any combination of the following clutches to slip and overheat due to loss of apply pressure:
A. Overrun clutch pack
B. Forward clutch pack
C. 3-4 clutch pack