HARSH UPSHIFTS/3-2 SHIFTS SERVICE INFORMATION (440-T4)

MODELS AFFECTED: 1985-1986 DE VILLE AND FLEETWOOD 1986 ELDORADO AND SEVILLE

Some 1985-1986 vehicies equipped with a 440-T4 transaxle may exhibit a harsh 3-2 coastdown shift when operated in designated high altitude areas.

This condition is a result of the 3-2 control valve spring calibration.

Correction can be achieved by installing a new 3-2 control valve spring. A service package has been released which contains:

Spacer Plate Gaskets (2) Instruction Sheet Spring, 3-2 Control Valve

The following part numbers apply to specific transaxies by model code.

Transaxle Service Package Model Identification --------------- -------------------- 8646981 5AC, 5AY, 6ACH, 6AWH

8646982 5AM, 6AAH, 6AMH, 6AFH 6APH, 6ASH, 6AYH

Refer to the appropriate Service Information Manual 440-T4 Transaxle Unit Repair section for control valve assembly service procedures.

Note: The installation of the 3-2 control valve spring package may result in a flare/slide bump condition on a 3-2 downshift when the vehicle is driven in a non-high attitude area.

This should be considered a normal operating characteristic and should not effect the durability of the unit over a short period of time (i.e., vacation periods, etc.). If the vehicle is expected to return to operation in a high altitude area, no corrective action should be attempted.

Use operation number K6570 at 2.7 hours for De Villes and 3.2 hours for Eldorados and Sevilles.

DESIGNATED HIGH ALTITUDE COUNTIES*

Requiring High Altitude Emission Control

STATE OF ARIZONA STATE OF NEVADA Apache Carson City Humboldt Navajo Douglas Lander Elko Lyon STATE OF COLORADO Esmeralda Mineral Eureka Storey Adams Jefferson White Pine Alamosa Lake Arapahoe La Plata Archuleta Larimer STATE OF NEW MEXICO Boulder Las Animas Bernalillo Mora Chaffee Lincoln Catron Rio Arriba Clear Creek Mesa Colfax Sandoval Conejos Mineral Curry San Juan Costilla Moffat De Baca San Miguel Crowley Montezuma Grant Santa Fe Custer Montrose Guadalupe Sierra Dolores Morgan Harding Socorro Delta Ouray Lincoln Taos Denver Park Les Alamon Torrance Douglas Pitkin Luna Union Eagle Pueblo McKinley Valencia Elbert Rio Blanco El Paso Rio Grande Fremont Routt STATE OF OREGON Garfield Saguache Gilpin San Juan Lake Grand San Miguel Gunnison Summit STATE OF UTAH Hinsdale Teller Beaver Piute Huerfano Washington Box Elder Rich Jackson Weld Cache Salt Lake Carbon San Juan Daggett Sanpete STATE OF IDAHO Davis Sevier Duchesne Summit Bannock Custer Emery Tooele Bear Lake Franklin Grand Uintah Bingham Fremout Iron Utah Blaine Jefferson Juab Wasatch Bonneville Madison Kane Wayne Butte Minidoka Millard Weber Camas Oneida Morgan Caribou Power Cassia Teton STATE OF WYOMING Clark Valley Albany Natrona Carbon Niobrara STATE OF MONTANA Converse Park Beaverhead Madison Fremont Platte Deer Lodge Meagher Goshen Sublette Gallatin Park Hot Springs Sweetwater Jefferson Silver Bow Johnson Teton Laramie Uinta STATE OF NEBRASKA Lincoln Weston Banner Sioux Kimball

*Counties vhich have substantially all of their area above 4000 ft. Ref. Federal Register, Vol. 42, No. 76, April 20, 1977, pg. 20464

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.