A/T - 3L30 Shift Bumps/Harsh Upshifts/Downshifts

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Number: 91-495-7A

Section: 7A

Date: MARCH 1992

Corporate Bulletin No.: 277115R

ASE No.: A2


Subject:
NEUTRAL TO DRIVE BUMP - HARSH 3-2 DOWNSHIFTS AND HARSH 2-3 LIFT FOOT

Model and Year:
1990-91 GEO TRACKER


TRANSMISSION APPLICATIONS:
1990/1991 HYDRA-MATIC 3L30 (MD2)
3-2 Downshifts and Harsh 2-3 Lift Foot (Update Calibration)
SUBJECT:
Neutral to Drive Bump, Harsh

TRANSMISSION MODELS:
UL-D25, UL-D27, UL-D28, UL-D33
VEHICLE APPLICATIONS:
Geo Tracker

Condition:
Harsh 3-2 downshifts, 2-3 lift foots and harsh neutral to drive engagement.

Correction:
New Calibration packages.

Date of Production Change:
Beginning with serial number 3 771 582, on January 31, 1991, the new calibration UL-D34 went into production to reduce the harsh shift conditions.

Service Parts Information: UL-D25, UL-D27, UL-D28 Models.

Service Package Number: 96040746-Package, Calibration Update

Package Contains:
Low Speed DTV Spring (Pink/Brown)
Servo Piston Assembly
High Speed DTV Spring (Green/White)
High Speed DTV Valve
Transfer Plate
Oil Pan Gasket
Servo Cover Gasket
Transfer Plate to Case Gasket
Transfer Plate to Valve Body Gasket
12 Screw and Washer Assemblies

Service Parts Information:
UL-D33 Model

Service Package Number:
96040747-Package, Calibration Update


Package Contains:
High Speed DTV Spring (Green/White)
High Speed DTV Valve
Transfer Plate
Oil Pan Gasket
Servo Cover Gasket
Transfer Plate to Case Gasket
Transfer Plate to Valve Body Gasket
12 Screw and Washer Assemblies

Parts are currently available from GMSPO.

Service Manual Reference:

When servicing any 1990/1991 HYDRA-MATIC 3L30 transmission, refer to the HYDRA-MATIC 3L30 (MD2) Automatic Transmission Unit Repair Section in your service manual.