A/T - Harsh Shift 1st to 2nd/3rd to 4th Gear

Bulletin No. T 85-38
File In Group 7
Number 115
Date Jan. '85
SUBJECT: HARSH 1-2 AND/OR 3-4 SHIFTS - THM 200-4R TRANSMISSION

MODELS AFFECTED: 1984 DEVILLES AND BROUGHAMS

Some 1984 Devilles and Broughams equipped with 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 TV Boost valve spring. (Refer to item #49 on page 200-4R-57 of the 1984 Service Information Manual.)

FIGURE 1 - THM 200-4R TRANSMISSION I.D. NAMEPLATE:

Starting on April 25, 1984 (Julian date 116) on AA models and May 8, 1984 (Julian date 129) on OM models (refer to Figure 1), a new control valve assembly which has a new TV Boost valve spring went into production on 1984 model THM 200-4R transmissions to fix this harsh 1-2 and/or 3-4 shift.
On transmissions built before the listed Julian dates, if a condition of harsh 1-2 and/or 3-4 shift is experienced and the cause is the damaged or mispositioned TV Boost valve spring, use the appropriate, new control valve assembly as listed below:

New Control Valve Assembly Model and Part Number Applications

CONTROL VALVE ASSEMBLY
MODELS PART NUMBERS

AA, AP 8639343
OM 8639915

For warranty purposes, use labor Operation Number K6560 at .9 hour.