TrailBlazer 2WD L6-4.2L VIN S (2003)
Automatic Transmission Dipstick - Dipstick Tube: Customer Interest
A/T - 4L60-E, TCC Shudder/Water in Transmission
Bulletin No.: 05-07-30-031
Date: November 11, 2005
TECHNICAL
Subject:
4L60-E Automatic Transmission/Torque Converter Clutch (TCC) Shudder, Water in Transmission (Repair Transmission and Replace Transmission
Filler Tube, Level Indicator and Seal)
Models:
2004-2005 Buick Rainier
2003-2005 Chevrolet TrailBlazer Models
2003-2005 GMC Envoy Models
2003-2004 Oldsmobile Bravada
2005 Saab 9-7X
with 4.2L In-Line 6 Cylinder Engine (VIN S - RPO LL8)
Condition
Some customers may comment on a shudder condition at approximately 64-80 km/h (40-50 mph) when the TCC engages.
Cause
This condition may be caused by water in the automatic transmission fluid (ATF). Water may enter the transmission by dripping from the cowl area onto
the handle of the transmission fluid level indicator.
Indications of water in the ATF may include:
^
Visible rust on the transmission fluid level indicator.
^
Visible water in the oil pan.
^
A milky white substance inside the pan area.
^
Spacer plate gaskets that appear to be glued to the spacer plate, valve body or case.
^
Rust on internal transmission iron/steel components.
Important:
For vehicles suspected of having a leaking transmission oil cooler that would cause contamination of the transmission fluid with coolant, the
following check should be performed before deciding to replace the radiator.
^
Remove the surge tank cap and examine the coolant for signs of contamination with transmission fluid (the coolant will have a milky, not clear
appearance).
^
If the coolant has a normal, clear appearance, the radiator should not be replaced.
The cooler can also be tested by following the Coolant System Leak Test procedure in the SI Document. Do NOT replace a radiator without
verifying that the transmission oil cooler is leaking.
Correction
First, repair the transmission and second, replace the transmission fill tube, seal and level indicator to prevent repeat water contamination of the ATF.
Transmission Repair
1.
Remove the transmission. Refer to the appropriate SI procedure.
2.
Disassemble and inspect the transmission. Refer to Unit Repair Automatic Transmission - 4L60-E/4L65-E.
Important:
