A/T - 4T45E Engineering Changes/Overhaul Revisions
File In Section: 07 - Transmission/TransaxleBulletin No.: 02-07-30-050
Date: December, 2002
INFORMATION
Subject:
Engineering Changes to the Valve Body, Pressure Regulator Valve, 2-3 Accumulator Valve and Bore for 2002-2003 Model Year 4T45E Transaxles and Subsequent Overhaul Procedures Which Affect 1995-2001 Model Year Transaxles
Models:
1995-2003 Chevrolet Cavalier
1997-2003 Chevrolet Malibu
1997-1999 Oldsmobile Cutlass
1999-2003 Oldsmobile Alero
1995-2003 Pontiac Sunfire
1999-2003 Pontiac Grand Am
1999-2001 Toyota Cavalier
with 4T40E or 4T45E Transaxle (RPOS MN4 or MN5)
The design of the pressure regulator valve changed with the introduction of the 2002 model year transmissions.
Important:
Shift quality of a repaired transaxle will be compromised if attention is not paid to the pressure regulator valve, spacer plate and gaskets.
The pressure regulator valve (1) shown at the above left is the design used through the 2001 model year. The arrows point to the cross drilling within the valve.
The pressure regulator valve (2) shown at the right is of the 2002 and newer valve which is a solid valve, not cross drilled.
Shown above is the valve body and the internal components of the 2001 and prior model years valve body.
The pressure regulator valve is # 328. This pressure regulator valve is cross drilled as shown above. In addition, you will see the 2-3 accumulator bore with its components, # 329 and 330. The service replacement valve body kit, P/N 24224399, for the 1995-2001 transaxles is of this same configuration. The pressure regulator valve in the service replacement valve body is not cross drilled and requires installation of the spacer plate and gaskets supplied with kit, P/N 24224399.
Shown above is the valve body and the internal components of the 2002 - 2003 valve body.
The pressure regulator valve is # 328. The pressure regulator valve is not cross drilled. You will also see that the 2-3 accumulator bore and its components are no longer present.
When servicing a 1995 through 2001 4T40E/4T45E transaxle, the pressure regulator valve # 328 must be changed (it is included in the overhaul kit, P/N 24224525). Also included in this overhaul kit is the new spacer plate and gaskets required when the pressure regulator valve is replaced in the valve body.
Parts Information
Parts are currently available from GMSPO.
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