This crossmember is designed as part of a fully-engineered LS swap mounting system for 1984-92 GM F-body vehicles. It has been CAD designed to provide an optimized balance of weight, stiffness and strength. This crossmember provides direct installation capability for 4th-gen F-body/GTO T56 and aftermarket Tremec T56 Magnum transmissions. Installation of a 4L60-4L70, 4L80/4L85, TH400 or 2004R automatic transmission can also be accomplished using this crossmember and the Hooker 12650HKR, 71223003HKR, or 71223004HKR adapter kits.
Designed for use in LS Swap applications (Engine mounted with Hooker 71221003HKR brackets only) or to accomplish an LT1/LT4 T56 transmission swap behind a Gen 1 SBC engine
Plate steel construction - provides a durable transmission mounting solution
CAD designed- provides optimized strength, stiffness and weight
Built-in divorced, adjustable torque arm bracket- solves installation issues with using transmissions not factory installed in 4th-gen F-body vehicles
Dual-arch exhaust passages - provides highest exhaust ground clearance available
Semi-gloss black powder coat finish- provides attractive corrosion-resistant appearance
Transmission installations other than 4th-gen F-body T56/T56 Magnum require the use of the following adapter kit: 4L60-4L70 transmissions - 71223003HKR, 4L80/4L85 transmissions - 71223004HKR, TH400/2004R transmissions - 12650HKR