A/T - Harsh 3-2 Downshift at High Altitudes
87olds2SUBJECT SHIFT CONDITIONS AND SERVICE NUMBER: 86-T-60
INFORMATION FOR HARSH 3-2 DOWNSHIFT
DATE: November 12, 1986
MODELS/YEARS ALL 1985-86 VEHICLES EQUIPPED WITH
THM 440-T4 (ME9) TRANSAXLE SECTION: 7A
This bulletin pertains to shift conditions and service information for:
I.. Harsh 3-2 Shift - High Altitude
II. Harsh 3-2 Shift - 3.0L Engine Delta 88 (H Series)
III. Harsh 3-2 Shift - Other than 3.0L Engine Delta 88 (H Series) or High Altitude
IV. Harsh 3-2 Shift Maneuver
I. HARSH 3-2 SHIFT AT HIGH ALTITUDE -
1985-86 Cutlass Ciera (A Series) 1985-86 Ninety-Eight (C Series)
1986 Delta 88 (H Series)
1986 Toronado (E Series)
Service Action:
A harsh 3-2 shift at high altitude conditions may be corrected by installing a service package that contains:
-Package, spacer plate gaskets (2) -Instruction sheet -Spring, 3-2 control valve
Service Parts Information:
FIGURE 1:
3-2 Control Valve Spring Transaxle Model Identification
Package Number (Refer to Figure 1)
8646979 6BCH, 6BDH, 6BHM, 6BZH, 5BX
8646980 6BAH
8646981 6ACH, 6AWH, 5AC, 5AY, 5BW
8646982 6AAH, 6AMH, 6AFH, 6APH, 6ASH, 6AYH, 6BBH, 6BHH, 5AM
8646983 6CMH, 6CNH, 6CFH, 5CM, 5CN
8646992 6BLH, 6BTH, 6BYH
8646993 5BR, 5CP, 5CW
8646994 5BV
Models used by Oldsmobile are underlined.
Service Manual Reference:
Refer to the THM 440-T4 (M E9) automatic transaxle unit repair table of contents for control valve assembly service information.
Service Notes:
Before installing a service replacement transaxle assembly (SRTA) at high altitude, install the new 3-2 control valve spring.
Refer to pages 3 and 4 of this bulletin for a geographical listing of high altitude areas.
II. HARSH 3-2 SHIFT AT ANY ALTITUDE - 1986 3.0L H SERIES
FIGURE 1:
Service Action:
A harsh 3-2 shift in a 1986 3.0L H Series (model 6BHH - refer to Figure 1) may be corrected by installing a service package that contains:
-Package, spacer plate gaskets (2) -Instruction sheet -Spring, 3-2 control valve
Service Parts Information:
Service Package Number 8646982
Service Manual Reference:
Refer to the THM 440-T4 (ME9) automatic transaxle unit repair table of contents for control valve assembly information.
III. HARSH 3-2 SHIFT CONDITION ON 1986 MODELS OTHER THAN 3.0L 6BHH MODEL, H SERIES, OR HIGH ALTITUDE USE
An incorrect load 3-2 control spring may cause a harsh 3-2 shift at 45 mph and below. Contact Oldsmobile TSCS for corrective information.
IV. HARSH 3-2 SHIFT MANEUVER (17 to 20 MPH AT ANY ALTITUDE) - A, C, H, 1986 E SERIES
Service Action:
At start of production (SOP) 1987, an orifice pipe has been added between the 1-2 servo release cover plate and the 3-2 coastdown valve to allow a smoother second gear apply. The four new parts installed as a set will service certain past model transaxles and may correct a harsh 3-2 shift maneuver at 17 to 20 mph.
If 3-2 shift harshness exists above 20 mph, replacing these parts will not be an effective correction. 3-2 shift harshness above 20 mph is to be corrected by 3-2 control spring replacement as described in Section I, II, or III of this bulletin.
FIGURE 1:
Service Parts Information:
Part Transaxle Model Identification
Number Description (Refer to Figure 1)
8662439 Body Asm. Oil Pump 6AAH, 6ACH, 6AFH, 6AMH, 6APH, 6ASH,
Complete - Cadillac Only 6AWH, 6AYH, 5AM, 5AY, 5AC
FIGURE 1:
Part Transaxle Model Identification
Number Description (Refer to Figure 1)
8662322 Body Asm. Oil Pump 6BAH, 6BBH, 6BCH, 6BDH, 6BHH, 6BLH,
Complete 6BMH, 6BTH, 6BYH, 6BZH, 6CHF, 6CMH,
6CNH, 5BR, 5BV, 5BW, 5BX, 5CM, 5CN,
5CP,5CW
8662376 Gasket, Release Cover All Models Listed Above
8662377 Pipe, Plug & Release Cover Asm. All Models Listed Above
8662394 Clip, Conduit All Models Listed Above
Service Manual Reference:
Refer to the THM 440-T4 (ME9) automatic transaxle unit repair table of contents for appropriate service information.
Service Notes:
If the new pump body assembly has a 1-pin 3rd clutch switch, remove it and replace with the 2-pin switch from the original pump body assembly.
At high altitude, when servicing the transaxle for this condition, also install the 3-2 control valve spring package covered in Section I of this bulletin.
A service package containing these four parts and instructions will be made available soon.
DESIGNATED HIGH ALTITUDE COUNTIES*
State of Arizona Apache Navajo
State of Colorado
Adams Jefferson
Alamosa Lake
Arapahoe La Plata
Archuleta Larimer
Boulder Las Animas
Chaffee Lincoln
Clear Creek Mesa
Conejos Mineral
Costilla Moffat
Crowley Montezuma
Custer Montrose
Dolores Morgan
Delta Ouray
Denver Park
Douglas Pitkin
Eagle Pueblo
Elbert Rio Blanco
El Paso Rio Grande
Fremont Routt
Garfield Saguache
State of Nevada
Carson City Humboldt
Douglas Lander
Elko Lyon
Esmeralda Mineral
Eureka Storey
White Pine
State of New Mexico
Bernalillo Mora
Catron Rio Arriba
Colfax Sandoval
Curry San Juan
De Baca San Miguel
Grant Santa Fe
Guadalupe Sierra
Harding Socorro
Lincoln Taos
Los Alamos Torrance
Luna Union
McKinley Valencia
State of Oregon Lake
Gilpin San Juan
Grand San Miguel
Gunnison Summit
Hinsdale Teller
Huerfano Washington
Jackson Weld
State of Idaho
Bannock Custer
Bear Lake Franklin
Bingham Fremont
Blaine Jefferson
Bonneville Madison
Butte Minidoka
Camas Oneida
Caribou Power
Cassia Teton
Clark Valley
State of Montana
Beaverhead Madison
Deer Lodge Meagher
Gallatin Park
Jefferson Silver Bow
State of Nebraska
Banner Sioux
Kimball
State of Utah
Beaver Piute
Box Elder Rich
Cache Salt Lake
Carbon San Juan
Daggett Sanpete
Davis Sevier
Duchesne Summit
Emery Tooele
Grand Uintah
Iron Utah
Juab Wasatch
Kane Wayne
Millard Weber
Morgan
State of Wyoming
Albany Natrona
Carbon Niobrara
Converse Park
Fremont Platte
Goshen Sublette
Hot Springs Sweetwater
Johnson Teton
Laramie Uinta
Lincoln Weston
*Counties which have substantially all of their area above 4000 ft. Ref. Federal Register, Vol. 42. No. 76, April 20, 1977, pg. 20464