Cummins Collection of Conversion Kits and other Parts
For gearhead truck enthusiasts and DIY diesel swap veterans, dropping a Cummins engine into a Chevy, Ford, or other truck is the ultimate power move. G Force Performance Products has you covered with Cummins conversion kits and swap parts designed to make your build easier. These kits bundle critical components—like adapter plates, flexplates, drop crossmembers, and Cummins motor mounts—so you can bolt a 6BT Cummins into your Chevy truck with confidence. The result? A killer diesel engine swap that delivers bone-rattling torque and reliability. G Force even offers bundles that combine these parts for savings, plus heavy-duty torque converters and hardware kits to match.
Cummins conversion kits are enthusiast-engineered for seamless swaps. For example, the is a full 1973–87 Chevy K-series conversion kit that "includes a transmission adapter and flexplate to mate a TH400, 700R4, or 4L80E to a 6BT Cummins" and even a 2″ drop crossmember to clear the large Cummins oil pan. This means you get a billet adapter plate and flexplate (2002-earlier Cummins to GM automatic), a bolt-in Drop Crossmember (for 4WD K-trucks), and motor mounts that bolt the Cummins engine to your stock frame, which lets you to bolt your Cummins engine into your K Series Chevy truck (73–87 GM K10/K20 4WD). This kit effectively tackles one of the more challenging parts of a Cummins to Chevy conversion.
Beyond the K-series kit, G Force covers other Cummins swap scenarios. They offer a line of transmission adapters for both early ('89–'02) and late ('03–'25) Cummins 6BT engines, fitting them to Chevy automatics (TH400/700R4/4L80E), Ford 5R110s, or Allison 1000 series trucks. Each kit comes with a billet aluminum adapter plate and flexplate. So, whether you're cruising or hauling heavy loads, the adapter kit ensures the Cummins couples up to the transmission straight (no weird angle).
G Force even makes the dedicated Cummins transmission adapters you need: for example, the GF-F5R110-SL kit bolts a 2003–2025 6BT to a 2003–2010 Ford 5R110 auto (with the Ford 6.4L starter), and their GF-A-S/GF-A-SL kits bolt '89–'02 and '03–'25 6BTs to Allison 1000 automatics. These swap-specific adapters mean no guesswork on engine side or flywheel, just bolt-and-go power.
Below is a quick reference to G Force's core Cummins swap parts (adapter kits, mounts, crossmembers) that turn your project into a reality:
GF-GMK3-KIT 1973–87 Chevy K-Series Cummins Swap Kit – includes '89-'02 Cummins-to-Chevy adapter plate & flexplate (6BT to TH400/700R4/4L80E) plus 2″ drop crossmember and Cummins motor mounts.
GF-GMDC 2″ Drop Engine Crossmember for 1973–87 Chevy K-Series 4WD (and 4WD Suburbans '88–'91). Drops the Cummins 6BT ~2″ to clear the oil pan, eliminating the need for a body lift on 4WD rigs. Bolt-in to OEM holes for strength.
GF-C-MM Cummins 6BT Motor Mount Kit for 1973–87 Chevy C/K pickups and 4WD Suburbans '88-'91. Bolts Cummins to factory frame mount isolators (2WD/4WD). CNC-cut steel mounts handle the torque.
GF-C-S/GF-C-SL Cummins-to-Chevy Adapter & Flexplate Kits- GF-C-S ('89–'02) and (' 03-'25) 6BT Cummins to Chevy. Billet adapter plate + flexplate to mate 5.9L Cummins to GM TH400/700R4/4L80E automatics. Includes hardware.
GF-A-S / GF-A-SL Cummins-to-Allison Adapter Kits- GF-A-S (' 89–'02 engines) and GF-A-SL (' 03–'25 engines) include bellhousing adapter plate, flexplate & bolts to mate a 6BT Cummins to an Allison 1000 auto. Positions trans straight; requires Ford 6.4L starter.
GF-F5R110-S / GF-F5R110-SL Cummins-to-Ford 5R110 Adapter Kit-. Adapts 2003–2025 6BT Cummins to a 2003–2010 Ford 5R110 auto. Includes adapter plate & flexplate. The Trans sits straight (not angled); it requires a Ford 6.4L or optionally a 6.0L starter.
These factory-tested pieces are the backbone of any Cummins engine swap. They're rigorously engineered and manufactured in the USA** and come with hardware (bellhousing bolt kits, flexplate bolts, starter bolts, etc.) so you don't have to scrounge the correct bolts.
**99% of these parts are manufactured in the US. One kit component is not.
*See detailed requirements on the individual product pages.
Once you've got the drivetrain worked out, it's time to hang the diesel. G Force's Cummins motor mounts and crossmembers are built for stock chassis integration. The GF-C-MM mounts (for 1973–87 Chevy trucks) bolt directly to the Cummins block and the OEM frame. According to G Force, "when installing a Cummins 6BT into your Chevy square body, this conversion motor mount allows for proper placement of the engine directly to the OEM frame mount isolators." In short, they keep your huge Cummins snug in place and aligned, whether you're bolting to a classic C10 or a tall Suburban frame. These steel mounts are precision-cut, and they work in both 2WD and 4WD models.
For 4WD trucks, G Force offers a matched Cummins Drop Crossmember. This 2″-lowered Crossmember (P/N GF-GMDC) bolts in place of the stock engine Crossmember on 1973–87 Chevy 4WD trucks (and Suburbans through '91). This Drop Crossmember creates space for proper Cummins engine alignment, which typically eliminates the need for a body lift or a cowl hood when installing a 6BT Cummins." With the Drop Crossmember in, your Cummins engine sits lower in the chassis, clearing the front suspension and 4WD linkage while keeping driveline angles correct. The Drop Crossmember allows for that extra clearance for the large Cummins oil pans." Combined with the conversion motor mounts, you retain the OEM ride height and clearance on a diesel swap without chopping up the frame.
No diesel swap guide is complete without mentioning transmission adapters. Our lineup covers the bases: from Cummins to Chevy to Ford and Allison, G Force has a kit. Each adapter kit features a precision-machined bellhousing plate and matching flexplate for your chosen transmission. For example, the Cummins-to-Chevy adapter (GF-C-S) utilizes a billet aluminum plate that positions Chevrolet automatic transmissions perfectly straight on the Cummins block.
Want to tow in a Ford F-250? The Cummins-to-5R110 kit (GF-F5R110-S/GF-F5R110-SL) includes an adapter plate and flexplate to mate a '03–'25 Cummins 6BT to a 2003–10 Ford 5R110 auto. And if you crave diesel durability on the highway, the Cummins-Allison kits (GF-A-S/GF-A-SL) bolt 6BT engines to Allison 1000 5-speed or 6-speed autos. In every case, these Cummins transmission adapters position the transmission straight (with no rotated angle) and come with the necessary hardware.
Beyond the core parts, G Force knows that swaps demand every advantage. They even offer heavy-duty torque converters tailored for Cummins power. These Cummins converters are "built like tanks" with massive torque capacity for hauling big loads. Swapping to a lower stall converter utilizes the lower RPM power band of the Cummins engine and dramatically improves throttle response.
Think of it as the finishing touch: the right converter helps your drivetrain launch harder without stress.
When you bundle everything together (adapter plates, mounts, crossmember, flexplate, bolts, torque converter, etc.), you're set up for success. All these pieces work in harmony: they bolt up precisely, align perfectly, and handle the Cummins' torque. The end result is a factory-quality Cummins to Chevy conversion (or any chassis you choose) that enthusiasts praise for its fit and strength.
Swapping a Cummins into your ride is a popular project that G Force simplifies." (Or a variation of my suggestion, eliminating the statement that the project is daunting or difficult. By using genuine G Force parts—engineered by gearheads for gearheads—you'll avoid the fitment headaches and find every bit of diesel torque. Whether you're building a sled-pull rig or a heavy-haul dually, G Force's Cummins conversion kits, crossmembers, motor mounts, and adapters let you focus on the fun part —rolling coal —instead of fabrication. Ready to rock the diesel world? Check out their Cummins swap parts and tech tips for everything you need to bolt in a big Cummins engine.