Savana 3500 V8-4.8L (2009)
Fluid Pan: Technical Service Bulletins
A/T - Fluid Pan Magnet Upgrade
INFORMATION
Bulletin No.: 08-07-30-040B
Date: May 05, 2009
Subject: Information on Normal Maintenance or Warranty Service for 4T40, 4T45, 4T65, 4L60 Automatic Transmission Oil Pan Magnet Upgrade
Models:
2002-2009 GM Passenger Cars and Light Duty Trucks
Equipped With the Following Transmissions:
4T40-E or 4T45 HYDRA-MATIC(R) Automatic Transmission (RPOs MN4, MN5, ME7)
4T65 Transmission (RPO M15 and MN7)
4L60 Transmission and Derivatives (RPO M30 is 4L60, M32 is 4L65, M70 is 4L70)
Attention:
Do not remove the transmission oil pan unless normal maintenance or diagnosis of a customer concern requires it.
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Supercede:
This bulletin is being revised to add 4T65 and 4L60 transmissions. Please discard Corporate Bulletin Number 08-07-30-040A (Section 07 -
Transmission/Transaxle).
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A new transmission oil pan magnet, P/N 29535617, was released for service. The current square transmission oil pan magnet may become saturated with
normal ferrous sediment and the Pressure Control Solenoid (PCS) is now collecting ferrous sediment, making it vary from design. For a given current the
PCS electromagnet is stronger, causing the line pressure to be less than needed.
When checking PCS line pressure (refer to Line Pressure Check in SI) and it shows that the line pressure is lower than required (refer to
Current-Amps/Line Pressure Chart in SI), for a given current at the PCS or the transmission oil pan was removed (for either normal maintenance or
warranty service), only then should the transmission oil pan magnet be upgraded.
1. Remove and discard the original square transmission oil pan magnet and install a new one in the current location (See graphics below for the
correct application).
2. Install the second new transmission oil pan magnet in the following location as shown in the illustration.
4T40 & 4T45
4T65E
