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GF-GMK3-KIT Adapter Conversion Kit for 1973-1987 GM K-Series 4WD w/ Dodge Cummins 6BT
InfoVehicle Info Needed
G FORCE PERFORMANCE PRODUCTSPART NUMBER: 472-GF-GMK3-KIT

GF-GMK3-KIT Adapter Conversion Kit for 1973-1987 GM K-Series 4WD w/ Dodge Cummins 6BT

$1,76500
ShippingShips on Sep 04, 2026
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GM
Adapter Conversion Kit
  • For 1973-1987 GM K-Series 4WD w/ Dodge Cummins 6BT
  • 2 in. Drop Crossmember

    G Force Performance GF-GMK3-KIT Features:

    G Force 73-87 GM Truck K Series Cummins Kit is comprised of many of the items needed for your G Force Cummins diesel engine conversion. It includes a transmission adapter and flexplate to mate a TH400, 700R4, or 4L80E transmission to a 6BT Cummins engine. G Force Cummins bolt-in 2" drop engine crossmember (or K Member) allows for proper engine placement and provides chassis strength to accommodate the added torque of the Cummins!

    • Fits Truck Model Years: 73-87.
    • Fits Engine Years: 89-02.
    • Fits Transmissions: Chevrolet TH400, 700R4, 4L80E.
    • This kit is comprised of some of G Force most popular items for your G Force 73-87 Chevy K Series Cummins conversion.
    • The Kit includes:
      • GF-C-S - Adapter and Flexplate - The 5.9 Cummins to Chevy Adapter Plate and Flexplate Kit accommodates 2002 and earlier Cummins 6BT engines bolting to a Chevy automatic transmission such as a TH400, 700R4, 4L80E, or similar transmission.
      • GF-GMDC - Cummins 6BT to Chevy Drop Crossmembe r- This 2" drop crossmember allows proper engine placement and often eliminates the need for a lift kit when installing a Cummins 6BT into a 73-87 Chevy 4WD truck.
      • GF-C-MM - Motor Mount - When installing a Cummins 6BT into your G Force 1973-1987 Chevy pickup, this conversion motor mount allows for proper placement of the engine directly to the OEM frame mount isolators. When used in conjunction with a G Force GF-GMDC Drop Crossmember on 4WD models, you can retain OEM drivetrain height. Without G Force GF-GMDC Drop Crossmember a vehicle body lift is required.
      • Adapter Bolt Kit, Premium grade bellhousing adapter bolt kits to make mounting the adapter plate to engine as simple as possible. Set of 9 bolts.
      • Flexplate Bolt Kit, -Flexplate bolts for mounting your G Force Cummins 6BT to a GM Bellhousing. 12mm x 1.25. 25mm underhead length. Set of 8 bolts
      • Starter Bolt Kit - Steel, zinc plated bolts constructed to strict engineering quality standards and serve as direct replacement bolts for replacing the Cummins 6BT starter. Set of 4 bolts with 3 washers

    Note: This kit ships in two boxes.

    • Adapt Popular Engines to Transmissions with G Force

      G Force Performance Transmission Adapters provide you with the ability to connect the most popular engine swaps (application pending) to vehicle-specific transmissions for reliable and customized builds and power increases. These kits feature premium adapters, plates, flywheels (where applicable), and hardware for seamless installation.

    Part TypeTransmission Adapter
    Product LineG Force Performance Transmission Adapters
    BrandG FORCE PERFORMANCE PRODUCTS
    Package Height5.0
    Package Width18.0
    Package Length21.0
    Weight32.0 PG
    Part CategoryPerformance Parts
    Part FitmentDirect Fit
    Vendor Part NumberGF-GMK3-KIT
    Package Qty1
    Package TypeEA
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