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.

Manufacturer installation notes

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

Manufacturer-listed applications

Match the engine, body, trim and installation requirements. All qualifications shown for an application apply together. Where this part requires a modified or aftermarket assembly, the vehicle listing alone does not confirm compatibility with factory equipment.

Vehicle	Configuration and qualifications
1973–1974 Chevrolet C10 Pickup 1973–1974 Chevrolet C20 Pickup 1973–1974 Chevrolet Blazer 1976 Chevrolet K5 Blazer 1973–1974 Chevrolet C10 Suburban 1986–1987 Chevrolet C20 1973–1974 Chevrolet C20 Suburban 1987 Chevrolet C15 1973–1974 GMC C15/C1500 Pickup 1973–1974 GMC C15/C1500 Suburban 1973–1974 GMC C25/C2500 Pickup 1973–1974 GMC C25/C2500 Suburban 1979–1986 GMC C1500 Suburban 1979–1986 GMC C2500 1987 GMC R1500 Suburban 1987 GMC R2500 1987 GMC R2500 Suburban 1975–1978 GMC C15 1975–1978 GMC C25 1975–1978 GMC C25 Suburban 1973–1982 GMC Jimmy 1987 GMC R1500	Quantity: 1 Submodel: Base Application notes: 2-Wheel Drive;LS Swap
1973–1974 Chevrolet C10 Pickup 1973–1974 Chevrolet C20 Pickup 1973–1974 Chevrolet Blazer 1976 Chevrolet K5 Blazer 1973–1974 Chevrolet C10 Suburban 1986–1987 Chevrolet C20 1973–1974 Chevrolet C20 Suburban 1987 Chevrolet C15 1973–1974 GMC C15/C1500 Pickup 1973–1974 GMC C15/C1500 Suburban 1973–1974 GMC C25/C2500 Pickup 1973–1974 GMC C25/C2500 Suburban 1979–1986 GMC C1500 Suburban 1979–1986 GMC C2500 1987 GMC R1500 Suburban 1987 GMC R2500 1987 GMC R2500 Suburban 1975–1978 GMC C15 1975–1978 GMC C25 1975–1978 GMC C25 Suburban 1973–1982 GMC Jimmy 1987 GMC R1500	Quantity: 1 Submodel: Base Application notes: 2-Wheel Drive;LT Swap
1975–1980 Chevrolet K5 Blazer 1975–1981 Chevrolet C10 1975–1981, 1986–1987 Chevrolet C20 1982–1986 Chevrolet C15	Quantity: 1 Submodel: Cheyenne Application notes: 2-Wheel Drive;LT Swap
1975–1980 Chevrolet K5 Blazer 1975–1981 Chevrolet C10 1975–1981, 1986–1987 Chevrolet C20 1982–1986 Chevrolet C15	Quantity: 1 Submodel: Cheyenne Application notes: 2-Wheel Drive;LS Swap
1975, 1977–1980 Chevrolet K5 Blazer 1975–1980 Chevrolet C10 1975–1980 Chevrolet C10 Suburban 1975–1980 Chevrolet C20 1975–1980 Chevrolet C20 Suburban 1987 Chevrolet R10 1987 Chevrolet R10 Suburban 1987 Chevrolet R20 1987 Chevrolet R20 Suburban	Quantity: 1 Submodel: Custom Deluxe Application notes: 2-Wheel Drive;LT Swap
1975, 1977–1980 Chevrolet K5 Blazer 1975–1980 Chevrolet C10 1975–1980 Chevrolet C10 Suburban 1975–1980 Chevrolet C20 1975–1980 Chevrolet C20 Suburban 1987 Chevrolet R10 1987 Chevrolet R10 Suburban 1987 Chevrolet R20 1987 Chevrolet R20 Suburban	Quantity: 1 Submodel: Custom Deluxe Application notes: 2-Wheel Drive;LS Swap
1978, 1980–1982 Chevrolet K5 Blazer 1975–1986 Chevrolet C10 1975–1980, 1982–1986 Chevrolet C10 Suburban 1975–1986 Chevrolet C20 1975–1977, 1979–1980, 1982–1986 Chevrolet C20 Suburban 1987 Chevrolet R10 1987 Chevrolet R10 Suburban 1987 Chevrolet R20 1987 Chevrolet R20 Suburban	Quantity: 1 Submodel: Silverado Application notes: 2-Wheel Drive;LT Swap
1978, 1980–1982 Chevrolet K5 Blazer 1975–1986 Chevrolet C10 1975–1980, 1982–1986 Chevrolet C10 Suburban 1975–1986 Chevrolet C20 1975–1977, 1979–1980, 1982–1986 Chevrolet C20 Suburban 1987 Chevrolet R10 1987 Chevrolet R10 Suburban 1987 Chevrolet R20 1987 Chevrolet R20 Suburban	Quantity: 1 Submodel: Silverado Application notes: 2-Wheel Drive;LS Swap
1981–1982 Chevrolet K5 Blazer 1975–1986 Chevrolet C10 1981–1986 Chevrolet C10 Suburban 1981–1986 Chevrolet C20 1981–1986 Chevrolet C20 Suburban 1982–1986 Chevrolet C15	Quantity: 1 Submodel: Custom Application notes: 2-Wheel Drive;LT Swap
1981–1982 Chevrolet K5 Blazer 1975–1986 Chevrolet C10 1981–1986 Chevrolet C10 Suburban 1981–1986 Chevrolet C20 1981–1986 Chevrolet C20 Suburban 1982–1986 Chevrolet C15	Quantity: 1 Submodel: Custom Application notes: 2-Wheel Drive;LS Swap
1981 Chevrolet K5 Blazer 1981 Chevrolet C10 1981 Chevrolet C10 Suburban 1981 Chevrolet C20 1981 Chevrolet C20 Suburban	Quantity: 1 Submodel: Deluxe Application notes: 2-Wheel Drive;LS Swap
1981 Chevrolet K5 Blazer 1981 Chevrolet C10 1981 Chevrolet C10 Suburban 1981 Chevrolet C20 1981 Chevrolet C20 Suburban	Quantity: 1 Submodel: Deluxe Application notes: 2-Wheel Drive;LT Swap
1975–1986 Chevrolet C10 1975–1980, 1982, 1984–1986 Chevrolet C10 Suburban 1975–1986 Chevrolet C20 1975–1980, 1982, 1984–1986 Chevrolet C20 Suburban 1987 Chevrolet R10 1987 Chevrolet R10 Suburban 1987 Chevrolet R20 1987 Chevrolet R20 Suburban	Quantity: 1 Submodel: Scottsdale Application notes: 2-Wheel Drive;LS Swap
1975–1986 Chevrolet C10 1975–1980, 1982, 1984–1986 Chevrolet C10 Suburban 1975–1986 Chevrolet C20 1975–1980, 1982, 1984–1986 Chevrolet C20 Suburban 1987 Chevrolet R10 1987 Chevrolet R10 Suburban 1987 Chevrolet R20 1987 Chevrolet R20 Suburban	Quantity: 1 Submodel: Scottsdale Application notes: 2-Wheel Drive;LT Swap
1978–1980 Chevrolet C10	Quantity: 1 Submodel: Big Ten Application notes: 2-Wheel Drive;LT Swap
1978–1980 Chevrolet C10	Quantity: 1 Submodel: Big Ten Application notes: 2-Wheel Drive;LS Swap
1984 Chevrolet C15	Quantity: 1 Submodel: Sport Application notes: 2-Wheel Drive;LT Swap
1984 Chevrolet C15	Quantity: 1 Submodel: Sport Application notes: 2-Wheel Drive;LS Swap
1979–1986 GMC C1500 Suburban 1979–1986 GMC C2500 1987 GMC R1500 Suburban 1987 GMC R2500 1987 GMC R2500 Suburban 1975–1978 GMC C15 1975–1978 GMC C25 1975–1978 GMC C25 Suburban 1975–1982 GMC Jimmy 1987 GMC R1500	Quantity: 1 Submodel: High Sierra Application notes: 2-Wheel Drive;LS Swap
1979–1986 GMC C1500 Suburban 1979–1986 GMC C2500 1987 GMC R1500 Suburban 1987 GMC R2500 1987 GMC R2500 Suburban 1975–1978 GMC C15 1975–1978 GMC C25 1975–1978 GMC C25 Suburban 1975–1982 GMC Jimmy 1987 GMC R1500	Quantity: 1 Submodel: High Sierra Application notes: 2-Wheel Drive;LT Swap
1979–1986 GMC C1500 Suburban 1979–1986 GMC C2500 1987 GMC R1500 Suburban 1987 GMC R2500 1987 GMC R2500 Suburban 1975–1978 GMC C15 1975–1978 GMC C25 1975–1978 GMC C25 Suburban 1975–1982 GMC Jimmy 1987 GMC R1500	Quantity: 1 Submodel: Sierra Classic Application notes: 2-Wheel Drive;LS Swap
1979–1986 GMC C1500 Suburban 1979–1986 GMC C2500 1987 GMC R1500 Suburban 1987 GMC R2500 1987 GMC R2500 Suburban 1975–1978 GMC C15 1975–1978 GMC C25 1975–1978 GMC C25 Suburban 1975–1982 GMC Jimmy 1987 GMC R1500	Quantity: 1 Submodel: Sierra Classic Application notes: 2-Wheel Drive;LT Swap
1979–1982 GMC C1500 Suburban 1979–1982 GMC C2500 1975–1978 GMC C15 1975–1978 GMC C25 1975–1978 GMC C25 Suburban 1975–1982 GMC Jimmy	Quantity: 1 Submodel: Sierra Grande Application notes: 2-Wheel Drive;LS Swap
1979–1982 GMC C1500 Suburban 1979–1982 GMC C2500 1975–1978 GMC C15 1975–1978 GMC C25 1975–1978 GMC C25 Suburban 1975–1982 GMC Jimmy	Quantity: 1 Submodel: Sierra Grande Application notes: 2-Wheel Drive;LT Swap
1977–1978 GMC C15	Quantity: 1 Submodel: Heavy Half Application notes: 2-Wheel Drive;LT Swap
1977–1978 GMC C15	Quantity: 1 Submodel: Heavy Half Application notes: 2-Wheel Drive;LS Swap
1977 GMC C15	Quantity: 1 Submodel: Indy Hauler Application notes: 2-Wheel Drive;LT Swap
1977 GMC C15	Quantity: 1 Submodel: Indy Hauler Application notes: 2-Wheel Drive;LS Swap
1978 GMC C15 1978–1982 GMC Jimmy	Quantity: 1 Submodel: Street Coupe Application notes: 2-Wheel Drive;LS Swap
1978 GMC C15 1978–1982 GMC Jimmy	Quantity: 1 Submodel: Street Coupe Application notes: 2-Wheel Drive;LT Swap