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- USA
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Ships within 48 hours · Estimated delivery Jul 9 - Jul 14
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Description
Cummins Diesel Engine Flywheel Housing P/N 3971630Condition: USED REBUILDABLE CORE The Cummins Flywheel Housing 3971630 is compatible with diesel engines 3. 8 4. 5 5. 9 and 6. 7 liter. It is a genuine part that is used for QSB6. 7 Cummins engines. The part comes with the OEM Part Numbers 3973063 4944346. All parts industrially cleaned and inspected for cracks and damage before shipping Part Number: 3971630 Manufacturer: CUMMINS Weight: lbs Additional Details: Genuine OEM Parts Please research ensure
Condition: USED/REBUILDABLE COREThe Cummins Flywheel Housing 3971630 is compatible with diesel engines 3.8 4.5 5.9 and 6.7 liter. It is a genuine part that is used for QSB6.7 Cummins engines. The part comes with the OEM Part Numbers 3973063 4944346.
Part Number: 3971630
Manufacturer: CUMMINS
Weight: lbs
Additional Details:
Genuine OEM Parts
Please research/ensure fitment of part to your specific vehicle before purchasing. Returns because of non-fitment are accepted with a re-stocking fee, however customer is responsible for return shipping.
Shipping:
If shipping outside the contiguous 48 states is required, reach out to [email protected] to confirm shipping details.
About Us:
Custard Core Supply provides the highest quality of new, new take off, used, and core parts. We provide a variety of gas and diesel parts to our customers. Based in Dallas, TX Custard Core Supply has been in business since 1998. If you do not see a product you are looking for on our page, please reach out!
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.7 ★★★★★
Based on 1379 reviews
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Product Reviews
★★★★★ 3
Quality and Price
Color: Original Grey
For me a little tight on my ankles
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Reviewed in the United States on March 20, 2026
★★★★★ 5
Wonderful for dry feet
Material Type: Black - 3 Pairs, Size: X-Large
I have been dealing with dry skin and problems with the heel of my foot, so I thought I would give these a try. I am so glad I did. They moisturize beautifully. A must is you are having trouble with your feet.
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Reviewed in the United States on May 20, 2026
★★★★★ 5
Heel Fisures
Material Type: Black - 3 Pairs, Size: X-Large
Fantastic product. Worked well beyond my expectations.
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Reviewed in the United States on May 20, 2026
★★★★★ 4
X-Large is about a size 12-13 shoe size foot USA.
Material Type: Black - 3 Pairs, Size: X-Large
I love them they work fantastic. I am a big guy with swollen feet. Wear size 12 to 13 USA Shoes. They fit me just fine not tight. My feet felt good after wearing them for two days. Some dry skin pulled off with them and it says to wash by hand. I dont know about the durability but I am hoping to get about 5 uses per pair. Before they become unusable.
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Reviewed in the United States on February 7, 2026
★★★★★ 5
Comfortable
Material Type: Black - 2 Pairs, Size: X-Large, Material Type: Black - 2 Pairs, Size: X-Large
I have very sensitive skin, so I usually need to wear socks at all times. These are especially comfortable because they don’t cover the toes, which helps with temperature control. The material is well-balanced—not too thick or too thin—and has just the right amount of stretch. I also appreciate the large traction area, which adds stability. Another plus is that they are completely fragrance-free.
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Reviewed in the United States on April 21, 2026