This crossmember is one part of the Hooker BlackHeart LS swap system for the 1978-1988 GM A/G-Body for an easy bolt-in engine swap. The modular design of this crossmember supports the following transmissions: 4L60//4L65/4L70/4L80/TH400/2004R/T56/T56 Magnum Transmissions (some transmissions require an optional transmission adapter - sold separately). This is a revised design and is fully interchangeable with part number 12644HKR.
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