Track OrderOrder Status & ReturnsHelpGift CardsHelpHelp CenterPhone1-800-345-4545
Shop by Category

Most Popular

Restoration

Shop All Categories

Shop New ProductsShop ALL BrandsTech ArticlesDeals
MY ACCOUNT
Order Status & Returns
CONTACT USHELP CENTER
Logo
Cart0
$000
Blackheart GM LS Engine Swap Transmission Crossmember for Select 1978-1988 GM Models
InfoVehicle Info Needed
HOOKER HEADERSPART NUMBER: 520-12644HKR-1

Blackheart GM LS Engine Swap Transmission Crossmember for Select 1978-1988 GM Models

$35895$399.95You Save$41.00
ShippingShips on Nov 12, 2026
Lowest PriceLowest Price Guarantee
Currently Unavailable

This product is currently not available. Please call customer service for assistance at 1-800-345-4545.

GM A/G-Body
Blackheart GM LS Engine Swap Transmission Crossmember
  • 1978-1988 GM Models:
    • Buick Regal
    • Chevy Malibu, Monte Carlo, El Camino
    • Olds Cutlass
    • Pontiac Bonneville, Gran Prix, Lemans
    • GMC Caballero
  • Multiple Transmissions
  • Steel

    Hooker Blackheart 12644HKR-1 GM LS Engine Swap Transmission Crossmember:

    • Works with 4L60, 4L65, 4L70, 4L80, TH400, 2004R, T56, and T56 Magnum transmissions behind a GM LS engine
    • Correct u-joint angles, when used with Hooker 12643HKR engine mounts
    • Compatible with Hooker LS swap manifolds, headers, and exhaust systems
    • Up to 3 in. dual exhaust system routing

    Hooker Blackheart 12644HKR-1 GM LS Engine Swap Transmission Crossmember Notes:

    • 4L60, 4L65, and 4L70 transmissions require add-on bracket 12655
    • 4L80 transmission requires add-on bracket 12656
    • applications that were NOT originally equipped with a 200-4R transmission, crossmember adapter 12647 is required.
    • Crossmember fitment has not been validated for El Camino applications
    • Not compatible with Tremec TR6060 transmissions
    • Part TypeTransmission Crossmember
    BrandHOOKER HEADERS
    Package Height6.25
    Package Width7.8
    Package Length48.6
    Weight21.2 PG
    Part CategoryPerformance Parts
    Engine TypeGM LS
    Transmission Mount IncludedNo
    Crossmember FinishBlack powdercoated
    QuantitySold individually
    Crossmember MaterialSteel
    Vendor Part Number12644HKR-1
    Package Qty1
    Package TypeEA
    No Questions
    No Reviews
    Please click here to download the instructions PDF file

    Items You Need

    70501363-R Blackheart LS Engine Swap Header-Back Exhaust System for GM Small Block

    HOOKER HEADERS

    70501363-R Blackheart LS Engine Swap Header-Back Exhaust System for GM Small Block

    Part Number : 520-70501363-R
    $1,21395$1349.95
    You Save$136.00
    70501364-R Blackheart LS Engine Swap Header-Back Exhaust System with Mufflers for 1978-1988 GM Small Block

    HOOKER HEADERS

    70501364-R Blackheart LS Engine Swap Header-Back Exhaust System with Mufflers for 1978-1988 GM Small Block

    Part Number : 520-70501364-R
    $1,07895$1199.95
    You Save$121.00
    Ratcheting Cutter for Tubing and Exhaust Pipe [Cuts1 3/8 in.to 2 5/8 in. Dia. Tube]

    JEGS

    Ratcheting Cutter for Tubing and Exhaust Pipe [Cuts1 3/8 in.to 2 5/8 in. Dia. Tube]

    Part Number : 555-80696
    $9999$122.99
    You Save$23.00
    Large Tailpipe Expander 2-1/8" to 3-7/16"

    JEGS

    Large Tailpipe Expander 2-1/8" to 3-7/16"

    Part Number : 555-W80662
    $3999$43.99
    You Save$4.00
    Medium Tailpipe Expander 1-1/2" to 2-7/16"

    JEGS

    Medium Tailpipe Expander 1-1/2" to 2-7/16"

    Part Number : 555-W80661
    $3699$40.99
    You Save$4.00
    32000 Pipe End Shaper Rounds Out And Reshapes Exhaust Pipe Ends

    LISLE TOOLS

    32000 Pipe End Shaper Rounds Out And Reshapes Exhaust Pipe Ends

    Part Number : 616-32000
    $4199
    Fender Cover with Pocket [23 in. W x 31 1/2 in. L]

    JEGS

    Fender Cover with Pocket [23 in. W x 31 1/2 in. L]

    Part Number : 555-65010
    $1499$16.99
    You Save$2.00
    2-Ton Low-Profile Aluminum Floor Jack [4,000 lbs. Capacity]

    JEGS

    2-Ton Low-Profile Aluminum Floor Jack [4,000 lbs. Capacity]

    Part Number : 555-80006
    $24499$269.99
    You Save$25.00
    6-Ton Jack Stands

    JEGS

    6-Ton Jack Stands

    Part Number : 555-80037
    $8099
    Wheel Chock [Solid Rubber]

    JEGS

    Wheel Chock [Solid Rubber]

    Part Number : 555-W41001
    $1299$14.99
    You Save$2.00
    Punch and Chisel Set 28 Piece Set

    JEGS

    Punch and Chisel Set 28 Piece Set

    Part Number : 555-W754
    $6799$74.99
    You Save$7.00
    20V 3/8" Drive Li-Ion Cordless Impact Wrench

    OEMTOOLS

    20V 3/8" Drive Li-Ion Cordless Impact Wrench

    Part Number : 693-24661
    $10995
    5-Piece Pry Bar Set

    JEGS

    5-Piece Pry Bar Set

    Part Number : 555-80024
    $2669$28.99
    You Save$2.30
    Round Magnetic Parts Tray [5 1/2 in. Round]

    JEGS

    Round Magnetic Parts Tray [5 1/2 in. Round]

    Part Number : 555-80080
    $549$5.99
    You Save$0.50
    Cut-Off Wheels [3 in. Diameter, Set of 4]

    JEGS

    Cut-Off Wheels [3 in. Diameter, Set of 4]

    Part Number : 555-M580C
    $599$6.99
    You Save$1.00
    Some parts are not legal for use in California or other states with similar laws / regulations
    p65 warning
    Your Cart

    Your shopping cart is empty!