Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Section 49 (Automatic Transmission Servicing): Identification: Transaxle
The Hydra-Matic® 4T40-E transaxle has a metal identification nameplate attached to the case exterior. See Fig 1. The information on the nameplate assists the technician in servicing the transaxle and ordering replacement parts from a GM Parts Catalog. Additional transaxle identification information is provided on the Service Parts Identification label. This label shows the Regular Production Options (RPO) as well as the standard and mandatory options. This label is affixed to the inside of each vehicle at the assembly plant.
Transaxle has a metal identification plate attached to rear face of transaxle case.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.