A/T - Harsh 1st-2nd and/or 3rd-4th Gear Shifts
Bulletin 84-7200-10Date Nov. '84
Ref. No. 85-047-7200
SUBJECT: HARSH 1-2 AND/OR 3-4 SHIFTS
MODELS AFFECTED: ALL 1984 MODEL THM 200-4R TRANSMISSION
Some 1984 THM 200-4R transmissions may exhibit a harsh 1-2 and/or 3-4 shift. This harsh 1-2 and/or 3-4 shift may be caused by a damaged or mispositioned T.V. Boost valve spring.
Starting April, 1984, a new control valve assembly which has a new T.V. Boost valve spring went into production on all 1984 model THM 200-4R transmissions to correct this harsh 1-2 and/or 3-4 shift. (Refer to Chart 1 for part numbers and model applications and Chart 2 for Julian date break points showing when the new control valve assembly went into production.)
On transmissions built before the Julian dates in Chart 2, if a condition of harsh 1-2 and/or 3-4 shift is experienced and the cause is the damaged or mispositioned T.V. Boost valve spring, use the new control valve assembly.
FIGURE 1:
The Julian date is shown on the nameplate (fig. 1). The nameplate is attached to the right rear side of the transmission case.
CHART 1
NEW CONTROL VALVE ASSEMBLY MODEL AND PART NUMBER APPLICATIONS
MODELS CONTROL VALVE ASSEMBLY
PART NUMBERS
BQ 8639914
BT, BY 8639912
OF 8639326
OG 8639452
OJ 8639462
OM 8639915
CHART 2
JULIAN DATE BREAKPOINTS WHEN NEW CONTROL VALVE ASSEMBLY WENT INTO PRODUCTION
MODEL JULIAN DATE
BQ 109
BT 115
BY 121
OG 110
OJ 114
OM 129
NOTE: Models not listed will have the new control valve spring assembly when they are produced.