Hurst Universal Tunnel Patch for GM Vehicles

For Tremec TKO 5-speed transmission conversions.

PART# 69510003

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This Hurst Universal tunnel patch is intended for fabricating a new tunnel when installing a Tremec TKO 5-speed transmission in most GM vehicles. The tunnel patch is constructed from 18-gauge mild steel and is pre-rolled and tapered to accommodate most floor pans to fit a Tremec TKO 5-speed transmission. May fit many other vehicles and other transmissions. Note: Trimming and fabrication will be required when doing a transmission conversion.


  • Intended for Tremec TKO 5-speed Conversions
  • Universal Tunnel Patch for Most GM Vehicles
  • May fit other Vehicles and Transmissions
  • Over 60 Years of Conversion Experience
  • Constructed from 18-gauge Mild Steel
  • Simplifies Transmission Conversions
  • Custom Designed


Emission Code5
Item GradePremium Replacement
Large End Width (in)9
Length (in)27.5
Panel PositionTransmission Tunnel
Product TypeFloor Pan Patch Panel
Small End Width (in)6
California Proposition 65 Chemical NameChromium (hexavalent compounds)
California Proposition 65 RequiredYes
Part Number69510003



This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.

Tech Resources

For Tremec TKO 5-speed transmission conversions. Trimming and fabrication will be required when doing a transmission conversion.
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