Montana AWD V6-3.4L VIN E (2004)
Channel Plate: All Technical Service Bulletins
A/T - 4T65-E, No Reverse Hot/Slips in Reverse
Bulletin No.: 04-07-30-033
Date: August 04, 2004
TECHNICAL
Subject:
No Reverse Hot, Transaxle Slips In Reverse When Hot, Bump In Reverse Hot (Retighten Valve Body Bolt (379) and Replace Channel Plate Gasket)
Models:
2003-2004 Cars
with 4T65-E Transaxle (RPO's MN3, MN7, M15 or M76)
Condition
Some customers may comment that the vehicle slips in reverse when hot, no reverse when hot, or they feel a bump when shifted into reverse when hot.
Cause
There are multiple possible causes. Listed below are some of the possible causes:
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Low Transaxle fluid level.
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Reverse Servo Cover snap ring out of retaining groove.
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Reverse Servo Piston seal rolled or cut.
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Channel Plate flatness out of specification.
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Channel Plate alignment holes improper depth.
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Valve Body bolt (379) incorrectly torqued.
Correction
Follow the procedure below for diagnostic tips and repair procedures.
1.
Inspect the reverse cover retaining ring for proper seating/retention.
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If the ring is incorrectly seated, reset the retaining ring.
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If the retaining ring is properly seated, continue with the next step.
2.
Perform a transaxle line pressure check in reverse. This will test the reverse servo piston seal for leaks.
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If the line pressure test is out of specification, inspect/repair the reverse servo piston seal. Refer to:
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Reverse Servo Replacement w/3.4L Engine SI Document ID # 1485540
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Reverse Servo Replacement w/3.8L Engine SI Document ID # 1485543
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If the line pressure test is within specification, continue with the next step.
3.
Remove the transaxle side cover. Refer to the appropriate SI Document.
