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The Hydra-matic 4L80E is a 4-speed automatic transmission which uses electronic control for smooth shifting. It offers a fourth gear overdrive to increase Beginning at the start of production for 1999 models, all THM 4L80-E transmissions were built with a revised manual 2nd band that is wider than the previousGet 4L80E transmission rebuilding tips, 4L80E troubleshooting help, 4L80E technical service bulletins, 4L80E diagnostics and 4L80E technical information 1. Transmission Fluid Leaks · 2. The RPM of the Engine can Flair when the Car is put in the Gear · 3. Limp Mode · 4. The Problem is coming from the Lock Up Torque to guide you through testing because of the may problems that can occur. The most common problems are loose or corroded wiring connections. To troubleshoot Pre-1993 4L80E transmissions use a different internal wiring harness and pass- through connector. This early harness has a problem with leaking fluid at the. not have 3rd start and bindup the solenoid was the problem. COMPLAINT: No Lockup. HYDRA-MATIC 4L80E Technician's Guide, also Mitchell & Motor. 4L80E Transmission Troubleshooting Guide​​ hydraulically controlled automatic transmissions, the 4L80-E transmission uses electrical signals to specific gear