NEW PARTS/ SERVICE INFORMATION 440-T4 TRANSMISSION

I. 3rd Clutch Plates

Service Action:

In 1985, 2.8L Chevrolet applications of the THM 440-T4 changed to single-sided 3rd clutch plates. At the start of 1986 production, a 11 THM 440-T4 transaxles were built with single-sided clutch plates. When servicing 3rd clutch plates on any year/model 440-T4, use the single-sided clutch plates. Refer to Figure I for transaxle identification information.

Service Parts Information:

Service Package Number: 8646938.

Service Manual Reference:

Refer to the THM 440-T4 (ME9) Automatic Transaxle Unit Repair Table Of Contents for 3rd clutch service information.

II. Input Shaft Seal Eliminated

Service Action:

All 1986 model THM 440-T4 transaxles were built without an input shaft to 4th clutch shaft seal. When servicing a THM 440-T4 built prior to 1986, it is not necessary to replace the input shaft to 4th clutch shaft seal. Refer to Figure 1 for transaxle identification information.

Service Manual Reference:

Refer to Page 440-T4-32, Figure 34, Item 627, pre-1985 Service Manuals.

III: Converter Clutch Regulator Valve Spring Eliminated

Service Action:

At the start of 1986 production, the converter clutch regulator valve spring (Refer to Figure 2, Item No 394) was eliminated on the following models of the THM 440-T4 transaxle: AAH, ACH, ADH, AFH, AMH, ARH, BHH, CFH, CHH, CMH, CNH, HBH and HJH, due to recalibration and fluid passage changes. Do not replace this spring on any listed model, as an increase of the apply feel of the transaxle converter clutch may result. Refer to Figure 1 for transaxle identification information.

Service Manual Reference:

Refer to the THM 440-T4 (ME9) Automatic Transaxle Unit Repair Table Of Contents for control valve assembly service information.

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.