HOOKER BLACKHEART Transmission Crossmember, GM 4L60, 4L65, 4L70, 4L80, TH400, 2004R & T56 (1978-1988 GM A- & G-Body LS)

4L60/4L65/4L70/4L80/TH400/2004R/T56/T56 Magnum Transmission Crossmember

• The LS Swap Crossmember for the GM G-Body has some very minor design updates & has been superseded from 12644HKR to part number 12644HKR-1
• Facilitates installation of a 4L60/4L65/4L70/4L80/TH400/2004R/T56/T56 behind an LS engine in 78-88 GM A/G Body applications (may require add-on bracket, see installation notes)
• Designed using CAD modeling/FEA analysis for optimal fitment, strength, weight, safety and appearance
• Welded steel construction
• Provides an optimized engine/transmission inclination angle that is critical to obtaining suitable U-joint working angles, when installed with Hooker 12643HKR engine mounts
• Designed in conjunction with other Hooker BlackHeart GM A/G-Body engine swap brackets to provide bolt-in installation of Hooker LS swap manifolds, headers and exhaust systems for this application
• Provides the highest clearance available for up to 3" dual exhaust system routing

Revised Design - Interchangeable with 12644HKR.

Integral component of the complete Hooker BlackHeart swap system for this application. Component features unique geometry that is not compatible for use with any other brand of engine mounting components. 4L60/4L65/4L70 applications require add on bracket P/N 12655HKR. 4L80 applications require add-on bracket P/N 12656HKR. For applications that were NOT originally equipped with a 200-4R transmission, crossmember adapter P/N 12647HKR is required. Crossmember fitment has not been validated for El Camino applications.

*NOT COMPATIBLE WITH TREMEC TR6060 TRANSMISSIONS.

TH350 Transmissions can reuse the factory transmission crossmember, but the slots in the center of the crossmember will need to be elongated in the forward direction.