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Hooker BlackHeart Transmission Crossmember

1970-81 2nd Gen F-body LS Swap Transmission Crossmember - 4L60 (multi-piece case only) /4L65 / 4L70 / 4L75 Automatic Transmissions

PART# 12614HKR

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$306.00   Suggested Retail
$247.46   Holleydays Price
Estimated shipping date: 01/22/2021
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LS swap 4L60 (multi-piece case only) /4L65 / 4L70 / 4L75 automatic transmission crossmember


  • Facilitates installation of a 4L60(multi-piece case only)/4L65/4L70/4L75 GM automatic transmission behind an LS engine in any year 2nd-gen F-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 2nd-gen F-Body LS engine swap brackets
  • Designed in conjunction with Hooker 2nd-gen F-body LS engine swap brackets to provide bolt-in installation of Hooker LS swap manifolds, headers and exhaust systems for this application
  • Will install with either a stock rubber, or Prothane™ 7-1604 poly mount
  • Provides the highest clearance available for up to 3" exhaust system routing


Application1970-1981 GM F-Body
BrandHooker BlackHeart
Emission Code5
EngineGM Small Block Gen III/IV (LS/LT Based)
Exhaust SeriesHooker BlackHeart
FinishBlack Powdercoated
Motor TypeGM LS
Product TypeCrossmember
Transmission Type4L60(multi-piece case only)/4L65/4L70/4L75
Type of ComponentCrossmember
Part Number12614HKR



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

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.Direct bolt-in installation on 70-74 subframes;installation on 75-81 subframes requires four horizontal holes to be drilled in subframe sidewall;no hole sawing or vertical drilling required.


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         X  Holleydays 2020 20% off and DD
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