SKU: 21639731780

2003-2007 Ram HD Coolant Bypass Kit (FPE-CLNTBYPS-CUMMINS-MAN)

Sale price$180.45 Regular price$200.50
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Ships within 48 hours · Estimated delivery Aug 23 - Aug 28

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Description

2003-2007 Ram HD Coolant Bypass Kit (FPE-CLNTBYPS-CUMMINS-MAN)The Fleece Performance Cummins Coolant Bypass Kit 2003 2016 is built to OEM or better standards for diesel truck owners who want a no compromise upgrade. Engineered, manufactured, and supported by Fleece the diesel performance specialists. Features Lowers coolant temperature at the rear cylinders Ensures consistent temperatures across all cylinders Prevents damaging coolant pressure build up Complete kit comes with braided hose and AN O ring fittings

The Fleece Performance Cummins Coolant Bypass Kit 2003-2016 is built to OEM-or-better standards for diesel truck owners who want a no-compromise upgrade. Engineered, manufactured, and supported by Fleece - the diesel performance specialists.

Features
  • Lowers coolant temperature at the rear cylinders
  • Ensures consistent temperatures across all cylinders
  • Prevents damaging coolant pressure build up
  • Complete kit comes with braided hose and AN O-ring fittings to ensure a leak-free installation.
  • Kits for MY 2003+ include billet hose brackets.
Specifications
  • Fuel Type: Diesel
  • Engine: Cummins
  • Transmission: Automatic
  • Country of Origin: US
Manufacturer Description

Increased Coolant Flow, Decreased Coolant Temperatures The rear cylinders on the 5.9/6.7L Cummins suffer from a lack of coolant flow, and therefore, experience the highest coolant temperatures.

This can cause excessive pressure to build in the cooling system, especially the rear of the block and blow out freeze plugs externally, or the smaller diameter plugs under the valve cover, leading to a failure.

Our coolant bypass kit adds a secondary thermostat, that unlike other brands, works based on temperature instead of excessive pressure. This solves the problem before pressure becomes an issue by ensuring consistent temperatures across all six cylinders.

Why do I need a Fleece Coolant Bypass? One of the biggest issues on the 5.9/6.7L Cummins is the coolant flow problem to the rear cylinders. This can cause catastrophic failure or blow outs of the freeze plugs in an over-temperature / over-pressure condition.

The Fleece Coolant Bypass is one of the most important additions you make to improve the reliability and longevity of the Cummins platform. The '03-'07 5.9L automatic transmission version will eliminate the factory transmission fluid heat exchanger.

The heat exchanger is not a fluid cooler; it was designed for use in cold climates to warm the transmission fluid with the engine coolant. It is not necessary for use in warm climates or high horsepower applications, nor does it detrimentally affect the trucks performance when removed. All ‘07-‘13 6.7 trucks, both automatic and manual equipped transmissions, do not have a transmission fluid heat exchanger.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. 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
SKU: 21639731780

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4.7 ★★★★★
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Kristi S
Phoenix, US
★★★★★ 5
A Hit with Both My Puppy and Older Dog!
I bought the Nylabone Moderate Chew FlexiChew Bone in the peanut butter and bacon flavor for my new puppy, and he absolutely loves them! What’s even better is that my other dog is just as obsessed with them, so it's been a hit with both. The size is perfect for my tiny puppy, and the flavor keeps them both engaged for a long time. These bones are durable enough to last, even with moderate chewing, and they help satisfy their natural chewing instincts. If you’re looking for a great chew toy for both puppies and small dogs, I highly recommend these Nylabones. They’re a definite favorite in our household!
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Reviewed in the United States on October 11, 2024
M
Verified Purchase
Mikele
Phoenix, US
★★★★★ 5
Good quality
Color: Red
Very sturdy for super chewer dog. Only change I would make is I wish it held more kibble but dog loves it and I don’t worry she will choke on a broken piece when I’m away.
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Reviewed in the United States on April 15, 2026
L
Verified Purchase
Laurie G
Birmingham, US
★★★★★ 5
BEST DOG TOY for TREATS EVER!!!!
Color: Brown
If I could have given more than 5 stars, I would have! I had been giving my 70 lb boxer peanut butter in femur bones that I got at the pet store for years. She loved them but the bones would break down from chewing and biting on them. I would have to throw them away when the edges got sharp in fear of cutting my dog's mouth and tongue. This PETSWEET dog toy was the answer. I have been using yogurt, peanut butter and pumpkin so far. I freeze them with the goodies as is suggested. My dog LOVES her evening treat now and I don't worry about sharp edges hurting her mouth. It is washable so more sanitary than the femur bones.
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Reviewed in the United States on January 25, 2026
F
Verified Purchase
Family of 8
Lowell, US
★★★★★ 4
Quality and durability
Color: Brown
Came as described. Easy to use.
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Reviewed in the United States on March 13, 2026
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Verified Purchase
Dawn K
Phoenix, US
★★★★★ 5
Great for super chewer.
Color: Red
Update to original review: After leaving initial review the seller reached out and asked how to fix it the issue. I was willing to try same product again. They sent me two and I have had no problems with either of the new ones. Great communication from seller. My dog loves the treat In the center and chews on the product forever. She has not been able to get the top off of either of the new ones. Thanks!
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Reviewed in the United States on January 10, 2026

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