A/T - Harsh Park/Neutral to Drive Engagement
Bulletin 87-7200-5Date June '87
Ref. No. 87-135-7200
Corp. Ref. No. 777129
SUBJECT: HARSH PARK/NEUTRAL TO DRIVE ENGAGEMENT-- NEW DESIGN FORWARD CLUTCH
MODELS AFFECTED: ALL 1981-1987 THM 200-4R (MW9) EQUIPPED VEHICLES (EXCEPT FOR 1986-87 BRF, 1984-85 BQ, AND 1983 BR MODELS)
BULLETIN COVERS
A 1981 through 1987 vehicle equipped with a THM 200-4R transmission may have a harsh PARK/NEUTRAL to DRIVE engagement feel. A new design "feed/bleed" system for the forward clutch gives more cushioning during forward clutch apply. This system can be used in most THM 200-4R applications to reduce a harsh DRIVE engagement feel.
FIGURE 1 - THM 200-4R TRANSMISSION IDENTIFICATION INFORMATION:
FIGURE 2:
DATE OF PRODUCTION CHANGE: (Figures 1 and 2)
April 25, 1986 (Julian date 115), these changes were introduced for all THM 200-4R models (except model BRF):
Forward Clutch Assembly, minus check ball in housing (618) Forward Clutch Piston Assembly (622) Additional waved plate (666) Front internal gear (633)
SERVICE ACTION
If a vehicle equipped with a THM 200-4R transmission, built prior to April 25, 1986 (Julian date 115), has a harsh Park/Neutral to Drive engagement, install the Service Package listed in Service Parts Information.
Models built after April 25, 1986 (Julian date 115), can be serviced with separate parts.
NOTICE: This system CANNOT be used on 1986-1987 BRF, 1984-1985 BQ, and 1983 BR models.
IMPORTANT: When servicing the forward clutch, select the correct backing plate (627). Backing plate selection affects piston travel, shift feel and clutch durability.
Backing plate selection: (Clutch fully assembled)
FIGURE 3:
FIGURE 4:
Apply an evenly distributed load in the direction indicated in Figure 3 to remove slack from the clutch assembly. Use 20 lbs. (9 kg) of pressure against the backing plate--excessive pressure will cause an inaccurate measurement. With the clutch assembly compressed, use a feeler gage to measure the distance between the backing plate and snap ring. Correct backing plate travel is 0.7 mm-1.5 mm (0.028" -0.059"). Refer to Figure 4 for backing plate identification information.
SERVICE PARTS INFORMATION
PART NUMBER DESCRIPTION
8639943 Neutral Drive Shift Package (Contains
Forward Clutch Assembly, Complete;
Front Internal Gear and Thrust Washer)
Parts available separately:
8657257 Forward Clutch Assembly, Complete
8639947 Front Internal Gear and Thrust Washer
(Can be used on ALL model years.)
SERVICE NOTES
Earlier design front INTERNAL GEARS (Service Package Number 8630909) CANNOT be used with THM 200-4R models built after April 25, 1986 (Julian date 115).