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Eagle 4340 Forged Crankshaft 3.75" Stroke Ford 4.6L Modular 1992-2009
$1158.99

If you're looking to beef up your ride's internals, the Eagle 4340 Forged Crankshaft is a solid choice. Built from tough 4340 steel, this crank is no joke when it comes to strength and reliability. It’s designed for serious applications, handling up to 1500 horsepower without breaking a sweat. I mean, this thing is forged using a non-twist process and goes through a multi-stage heat treatment that really puts it through its paces.

Each journal gets the royal treatment too—micropolished to an R.A. of 3 or better, which means you're getting a smooth surface that helps reduce wear and tear. Plus, the .125" radius on the journals adds extra strength, but don't forget, you'll need chamfered bearings to match. It's all about that perfect fit for your setup.

What I really appreciate is the attention to detail. These cranks are internally balanced and are built with a Ford rod journal width, regardless of the diameter. That means you can easily drop it into a few different builds without worrying about compatibility issues.

And if you're looking to shed some weight, check out the 'Lightweight' versions. They’ve got knife-edged counterweights that can save you about 5-6 pounds, which can make a noticeable difference in performance, especially if you're chasing those last few tenths on the track.

For those of you who might not need the heavy-duty forged option, Eagle also offers cast steel crankshafts. These are a great alternative to factory casts and come with all the right dimensions to use OE-style bearings. They’re rated for up to 500 horsepower, making them a solid choice for street builds or lighter performance applications.

Here are the key specs:

  • Material: Forged 4340 steel
  • Intended balance: Internal
  • Target bobweight: 1600g
  • Stroke: 3.750"
  • Rod journal: 1.889"
  • Rod journal width: 1.900"
  • Main journals: 2.657"
  • Minimum rod length: 5.850"
  • Typical weight: 49 lbs.
  • Flywheel bolts: 8

Fitment:

  • Ford Crown Victoria 1992-2009
  • Ford E-150 1997-2008
  • Ford Expedition 1997-2004
  • Ford Explorer 2002-2009
  • Ford F-150 1997-2000
  • Ford Mustang Bullitt 2008-2009
  • Ford Thunderbird 1994-1997

Note: Make sure to balance the crankshaft to match your specific rods and pistons for optimal performance.

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WARNING: Cancer and Reproductive Harm
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Vehicle
1992-2009
Ford Crown Victoria
1997-2008
Ford E-150
1997-2004
Ford Expedition
2002-2009
Ford Explorer
1997-2000
Ford F-150
1994-1997
Ford Thunderbird

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Who is EAGLE?

EAGLE SPECIALTY PRODUCTS, aka EAGLE, has been at the forefront of developing top-quality engine components. The company officially started back in 1992 but has been developing their product for ten years prior.  Since the company started, it has continuously produced some of the market's best engine components and is widely used by engine builders worldwide.

Imitated But Not Duplicated

Due to the company's success, its products have been imitated by other companies even up to the part numbers. But the similarity ends only up to how they look. EAGLE uses the finest materials and has invested in the most state-of-the-art manufacturing machinery for them to create a product that would be able to take any punishment it is subjected to. It is tested to be superior to other brands and considered the best upgrade for OEM counterparts.

No To Shortcuts

The company sets the benchmark on how valves should be properly made. Using their years of experience creating rods, they have already designed over 200 different rods and 180 crankshafts. The company does not allow cost to compromise its material used, manufacturing process, and quality test. 

High-End Quality

All of Eagle's products are made up of high-quality materials. They use certified 4340 Chromoly steel. Using their own special heat treatment process, they are able to create a product that is much stronger compared to other competitors using the same raw material. 

They manufacture their rods using a 2-piece forging process that allows the rod to be stronger. This process orients the "grain" of the metal to the direction of the stress. Eagle uses a state-of-the-art Sunnen Krossgrinding system that allows them to create perfect cuts and bore consistently. 

Purchase EAGLE rods at Vivid Racing

If you want to upgrade your engine rods to something stronger and more reliable, then EAGLE is the brand for you. With their proven design and formula for creating rods, they have been sought after by top racing teams and engine builders. If they trust Eagle, so can you. Visit Vivid Racing and check out the list of parts specifically for your needs.

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