A/T - Firm or Harsh 1-2 Shift Soft or Slipping 1-2 Shift
Bulletin 84-7200-8ADate Sept. '84
Ref. No. 84-331-7200
SUBJECT: I. FIRM OR HARSH 1-2 SHIFT II. SOFT OR SLIPPING 1-2 SHIFT
MODELS AFFECTED: 1983-1984 THM 200-4R TRANSMISSIONS MODELS BT, BY, BQ AND OM
NOTICE: This information supersedes Bulletin 84-7200-8. Please discard previous bulletin and replace it with this one. Subject matter of original bulletin was incorrect.
Some 1983 and 1984 THM 200-4R transmissions (Models BT, BY, BQ, & OM) may experience a condition relating to the above subject.
Beginning in February 1984, the parts in the service packages listed below went into production to correct these conditions.
Subject I. Firm or Harsh 1-2 Shift
Use the following service package for transmission models BT & BY.
Service Package: 8639912
1 - Control Valve Body Assembly 1 - Intermediate Servo Cushion Spring 1 - 1-2 Accumulator Piston Spring 1 - Pressure Regulator Valve Spring 1 - Control Valve Body Spacer Plate 1 - Instruction Sheet
FIGURE 1:
FIGURE 2:
Service Procedure:
Remove the following parts and replace them with the parts contained in the above service package.
1. Control Valve Body Assembly
2. Intermediate Servo Cushion Spring
3. 1-2 Accumulator Piston Spring
4. Pressure Regulator Valve Spring
5. Control Valve Body Spacer Plate
6. *3-4 Accumulator Piston Spring
NOTE: The 3-4 Accumulator Piston Spring item #6 above is to be removed and discarded. The 3-4 accumulator piston is to be assembled as shown in Figures 1 and 2.
Subject II. Soft or Slipping 1-2 Shift
Use the following service package for transmission models BQ and BM.
Service Package 8639914 for the BQ model transmission
1 - Control Valve Body Assembly 1 - 3-4 Accumulator Spring
Set-vice Package 8639915 for the OM model transmission
1 - Control Valve Body Assembly 1 - 3-4 Accumulator Spring
Service Procedure:
Remove the control valve body assembly and the 3-4 accumulator spring from the transmission and replace with the control valve body assembly and the 3-4 accumulator spring provided in the appropriate service package.