C4 Corvette How-To: 4+3 Overdrive Bypass

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This mod will bypass the ECM and allow "on-demand" overdrive operation (in any gear, at any speed, whether warm or cold).

Disclaimer: I accept no responsibility for any malfunctions or damage resulting from this modification. Proceed at your own risk!

This modification assumes your Overdrive is operating correctly, and all wires and connections, relays and switches, are present and functional.

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This detailed how-to guide includes complete step-by-step instructions for bypassing your C4's 4+3 overdrive system, including:

✓ ECM wiring and bypass procedures
✓ Harness connector identification
✓ Switch replacement instructions
✓ Shifter adjustment procedures
✓ Detailed diagrams and part numbers
✓ Complete reassembly steps

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