Technical Bulletin #837
4T65-E
Automatic Transmission Case, Cooler Fitting and Torque Converter Drain
Back Check Ball Change
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Technical Bulletin #837 |
4T65-E
Automatic Transmission Case, Cooler Fitting and Torque Converter
Drain Back Check Ball Change
This bulletin effects cars built after January 19, 2004 with one of the following automatic transmissions:
| Transmission | RPO Code |
| Transmission Auto 4 SPD, HMD, 4T65-E, Heavy Duty |
MN7 |
| Transmission Automatic 4-Speed 4T65-E, Enhanced Electronic |
M15 |
| Transmission Auto 4 SPD, HMD, 4T65-E PTU, O/D |
M76 |
| Transmission, Auto 4 SPD, 4T65-E |
MN3 |
Effective with Julian date 4019 (January 19, 2004), the 4T65E transaxle cases and cooler fittings have changed and are not interchangeable with past models.
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Torque the new cooler fittings to 21 N•m (23 lb ft). The converter drain back check ball (420C) has been removed from the cooler line fitting and is now located in the channel plate.
If you get a concern of no movement in the morning or after sitting for several hours, the cooler check ball should be inspected.
The best way to determine where the check ball is located is to look at the cooler line fittings. The old fittings are different sizes (3/8-18 NPSF & 1/4-18 NPSF) and would contain the cooler check ball. The new fittings are the same size as each other (9/16-18 UNF) and do not have a cooler check ball.
“Portions of materials contained herein have been reprinted with permission of General Motors Corporation, Service and Parts Operations” under License Agreement #10228