Hooker Blackheart 12627HKR Transmission Crossmember

Compatible with 1967-69 GM F-body/1968-74 X-body LS/LT Swap Transmission Crossmember - 4L80/4L85 GM Automatic Transmissions

PART# 12627HKR

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LS/LT swap 4L80/4L85 automatic transmission crossmember


  • Facilitates installation of a 4L80/4L85 GM automatic transmission behind an LS engine in any year 1st-gen F-body or 3rd-gen X-body
  • Designed using CAD modeling/FEA analysis for optimal fitment, strength, weight, safety and appearance
  • High-strength low-alloy steel construction
  • Provides an engineered 3 to 3.5 degree engine/transmission inclination angle that is critical to obtaining suitable U-joint working angles, when installed with Hooker 1st-gen F-Body & X-body LS engine swap brackets
  • Designed in conjunction with Hooker 1st-gen F-body & X-body LS/LT engine swap brackets to provide bolt-in installation of Hooker LS swap headers and exhaust systems for this application
  • Installation requires use of transmission mount 71223029HKR (black) or 71223030HKR (red)
  • Provides the highest clearance available for up to 3" exhaust system routing

Product Attributes

BrandHooker Blackheart
Emission Code5
Manufacturer Part Number12627HKR
Product TypeTransmission Crossmembers
Part Number12627HKR



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

This Hooker Blackheart product has been designed only for use on vehicles which are equipped with a stock front subframe and stock steering and suspension components. It is not compatible with any Hooker Blackheart product that has been designed specifically for use with Detroit Speed products.

Integral component of the complete Hooker swap system for this application.Component features unique geometry that is not compatible for use with any other brand of engine mounting components.


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    Some parts are not legal for use in California or other states with similar regulations.