Hooker Blackheart Transmission Crossmember

1973-1987 GM C-10/15 2WD, LS/LT swap T56/T56 Magnum Transmission Crossmember - Also Fits 1979-1987 C20 2WD & 1973-1982 Blazer/Jimmy 2WD

Part # BHS550
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Vehicle emissions regulations are not applicable to this item.

See Emissions Details
These new crossmembers have been redesigned and are less expensive than the previous crossmember & work with engine mounting brackets BHS540 for both the GM LS & Gen-V LT engines. Choose the crossmember based on the transmissions that you want to run in your 1973-1987 C10: • Crossmember BHS548 fits 4L60E, 4L65E, 4L70E, 4L75E, and 6L80 Transmissions • Crossmember BHS549 fits 4L80E, and 4L85E Transmissions • Crossmember BHS550 fits T56, and T56 Magnum Transmissions These crossmembers, when used with BHS540, provide the ideal u-joint angles and the best clearance for 3.00" dual exhaust.


  • Revised Design with Lower Pricing
  • Fits 1973-1987 C10/15 2WD, 1979-1987 C20 2WD & 1973-1982 Blazer/Jimmy 2WD
  • LS/Gen-V LT Swap Transmission Crossmembers
  • Designed for Use with All 1973-1987 C10 LS/Gen-V LT Swap Components
  • Use with BHS540 Engine Mounting Brackets (Also Works with 12621HKR)
  • Designed Using CAD Modeling/FEA Analysis for Optimal Strength, Weight, Safety & Appearance
  • Welded Steel Construction w/ Black Powder Coated Finish
  • Provides an Optimum Engine/Transmission Inclination Angle That is Critical to Obtain Suitable U-Joint Working Angles, when installed with BHS540 Engine Mounting Brackets
  • Designed in Conjunction with Other Hooker Blackheart C10 Engine Swap Parts to Provide Bolt-in Installation of Hooker LS and LT Swap Manifolds and Exhaust Systems for this Application
  • Provides the Highest Clearance Available for up to 3.00” Exhaust System

About Hooker BlackHeart

The BlackHeart team utilizes the latest technology and materials to design exhaust systems, engine swap kits, and mufflers for both import and domestic cars and trucks. Hooker BlackHeart is platform-engineered to provide superb performance, aesthetics, and fitment.

Application1973-1987 Chevrolet / GMC C10 Series Truck
Brand Hooker BlackHeart
Choose Your PartCrossmember
Emission Code6
EngineGM Small Block Gen III/IV (LS Based)
GM Small Block Gen V (LT1/LT4 Based)
FinishBlack Powdercoated
Motor TypeGM LS
Product TypeTransmission Crossmember
TransmissionT56 GM
T56 Magnum GM
Type of ComponentCrossmember
Part NumberBHS550

Vehicle emissions regulations are not applicable to this item.
New Headers are being developed for use with these crossmembers and the engine mounting brackets BHS540. BHS540 can be used for both LS & Gen V LT swaps using the proper clamshell mounts to fit the engine. The existing headers fit these crossmembers when used with LS swap mounts 12621HKR. These Crossmembers Along with Engine Mounting Brackets BHS540 work with LS Cast Exhaust Manifolds: 8501HKR, 8501-1HKR, 8501-3HKR, 8501-4HKR, 8501-5HKR, 8502HRK, 8502-1HKR, 8502-3HKR, 8502-4HKR, 8502-5HKR, 11730FLT, 11730-1FLT, or 11730-3FLT. These Crossmembers Along with Engine Mounting Brackets BHS540 work with Gen-V LT Cast Exhaust Manifolds: BHS516, BHS517, or BHS518. Application Specific Headers Will Be Available Soon for these Mounts

*Free Shipping & Handling only offered to the contiguous US on orders over $100, excludes clearance parts and oversized packages.

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