- Factory Installed Upgrade Available For Any 1955-57 Body
- ONLY AVAILABLE WHEN ORDERING AN RDS BODY!
- Custom New Steel 16-Gauge Tunnel
- Comes Fully Formed, Welded And Installed
- Enlarged Nearly 2" To Allow Easy Installation Of GM 4L60, 4L80, 6L80, 6L90 And Tremec T-56 Transmissions
- Also Works With The GM 8L And 10L Series Transmissions
- May Be Ordered With Recessed Firewalls RFW-56-Upgrade Or RFW-57-Upgrade
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