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Description
1973-1987 GM K Series Cummins Conversion Kit GF-GMK3-KITOur 73 87 GM Truck K Series Cummins Kit is comprised of many of the items needed for your Cummins diesel engine conversion. It includes a transmission adapter and flexplate to mate a TH400, 700R4, or 4L80E transmission to a 6BT Cummins engine.? Our 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
Our 73-87 GM Truck K Series Cummins Kit is comprised of many of the items needed for your Cummins diesel engine conversion. It includes a transmission adapter and flexplate to mate a TH400, 700R4, or 4L80E transmission to a 6BT Cummins engine.? Our 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 our most popular items for your 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 Crossmember-? 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 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 our GF-GMDC Drop Crossmember a vehicle body lift is required.
- GF-BoltKitAdapter - 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.
- GF-BoltKitFP?- Flexplate Bolt Kit, -Flexplate bolts for mounting your Cummins 6BT to a GM Bellhousing. 12mm x 1.25. 25mm underhead length. Set of 8 bolts
- GF-BoltKitStarter - 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.
Application:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1975-1986 | Chevrolet | K10 Suburban | |
| 1975-1976 | GMC | K15 | |
| 1975-1986 | Chevrolet | K20 | |
| 1973-1974 | Chevrolet | K20 Pickup | |
| 1975-1986 | Chevrolet | K20 Suburban | |
| 1975-1978 | GMC | K25 | |
| 1973-1974 | GMC | K25/K2500 Pickup | |
| 1979-1984 | GMC | K2500 | |
| 1977-1986 | Chevrolet | K30 | |
| 1973-1974 | Chevrolet | K30 Pickup | |
| 1977-1978 | GMC | K35 | |
| 1979-1984 | GMC | K3500 | |
| 1987 | Chevrolet | V10 | |
| 1987-1988 | Chevrolet | V10 Suburban | |
| 1989-1991 | Chevrolet | V1500 Suburban | |
| 1987 | Chevrolet | V20 | |
| 1987-1988 | Chevrolet | V20 Suburban | |
| 1989-1991 | Chevrolet | V2500 Suburban | |
| 1987 | Chevrolet | V30 |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
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4.3 ★★★★★
Based on 9 reviews
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Product Reviews
★★★★★ 5
Must buy: Comfort + Casual + Well Made / Ventilated
Size: 8, Color: Brown
Just buy it! I have put in roughly 15,000 steps in this shoes in 10 days and I can't believe how comfortable they are after this much rough use in short amount of time. I highly recommend this shoes to anyone looking for comfort in casual style.
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Reviewed in the United States on May 4, 2026
★★★★★ 5
WIDE Dress Shoes With SUPPORT
Size: 10.5, Color: Brown
I've seen dress shoes and worn dress shoes before, but these are simply the best dress shoes I've ever worn my entire life. 99% of dress shoes have the same problem, they have the thinnest little soles that offer no support. BRUNO MARC HAS SOLVED THE PROBLEM. These dress shoes not only support wide feet like mine who historically have had and still have little support in the market, but Bruno Marc has wide options that fit perfectly, and the support with the thick foam sole is so needed and awesome. I had a pleasant surprise putting these things on and there being some tactile grip enhancers inside the shoe so you can feel the shoes better and get a little tickle / massage while you're at it. These things are dripping with style, easy to wear, and while they might look firm on the outside, on the inside the shoe just has such a nice flexibility and foamy feel, the top where the top of your feet feel the roof of the shoe, it has such perfect ooey gooey support I can't believe it. The outside sole also has this neat tactile feel. The durability looks good and feels good for now.
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Reviewed in the United States on September 28, 2025
★★★★★ 5
Perfect Blend of Comfort and Style
Size: 9, Color: Brown, Size: 9, Color: Brown
I recently purchased size 9 of these shoes, and they exceeded my expectations in every way! Here’s what I love about them:
1. Comfort: The moment I put them on, I noticed how soft and supportive they felt. The cushioning provides all-day comfort, making them perfect for long walks, workdays, or running errands.
2. Fit: The sizing is spot-on! I ordered my usual size, and they fit perfectly with no need to size up or down. There’s enough room for my toes to move without feeling too loose or tight.
3. Style: These shoes look even better in person. The design is sleek and versatile, making them easy to pair with both casual and semi-formal outfits. I’ve received several compliments already!
4. Durability: I put it on the day of purchase. After wearing them daily for a couple of days, they still look brand new. The stitching and material seem high-quality and built to last.
5. Value for Money: For the price, these shoes deliver exceptional value. You’re getting premium comfort and style without breaking the bank.
Final Thoughts: If you’re looking for shoes that offer comfort, style, and durability, I highly recommend giving these a try. I’ll definitely be considering another pair in a different color soon!
To conclude, I’m very happy for this purchase. Will definitely buy again.
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Reviewed in the United States on January 13, 2025
★★★★★ 5
Great Purchase
Size: 12, Color: Black
These shoes are great. They look great and extremely comfortable.
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Reviewed in the United States on May 10, 2026
★★★★★ 5
Comfortable, Easy to Clean, and Held Up at Coachella
Size: 12, Color: White, Size: 12, Color: White
I’m really happy with this purchase. The shoes are very comfortable, and the product description is accurate. I followed the sizing recommendation based on my foot type and went one size up—they fit perfectly.
I bought these for Coachella, and they definitely held up. I was on my feet all day, and they stayed comfortable the entire time. What impressed me most is how easy they were to keep clean. At the end of each day, I was able to wipe them down and maintain their whiteness without much effort.
Once I got home, I gave them a deeper clean, and they honestly looked as good as new. Even the laces cleaned up easily.
Now I’ve transitioned them into my regular work shoes, and they still look great. Overall, I’m very satisfied with this purchase and would definitely recommend them.
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Reviewed in the United States on May 4, 2026
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