All Dynotech driveshafts are built to exacting standards and are made with the highest quality materials.

  • Dynotech holds shaft runout to less than 0.010″.
  • Dynotech balances all driveshafts to less than 0.20 oz-in
  • Dynotech holds u-joint clearance to less than 0.002″.
  • Dynotech builds all shafts to within 1/16″ (.0625″), guaranteed to fit!
  • Dynotech has the capability to balance most shafts at up to 8,000 RPM

Whether you choose steel or aluminum.
The staff at Modern DriveLine can help guide you to the best choice for your vehicle’s application.

Here’s a quick overview of driveshaft choices.


Chrome Moly – Steel tube is usually drawn over mandrel (D.O.M.) with chromium and molybdenum added. This is the top-of-the-line steel driveshaft usually used for very high horsepower, heavy cars.
Steel weld yokes.

Pros: Very high torsional strength
Cons: The most expensive of all steel driveshafts, only available in 3” diameter and heavy.


D.O.M. 4140 – This is the most common racing shaft available, from circle track to drag racing there’s something to fit every application. If the shaft is sized correctly there’s no car that can overpower this shaft.
Steel weld yokes.

Pros: Much stronger than seam tube, relatively high critical speed.
Cons: Not many, only slightly more expensive than a seam tube driveshaft, heavy.




6061 T6 – This is the most common OEM application for an aluminum driveshaft. Best suited for everyday applications or restoration cars, sometimes a nice alternative to the heavy steel shaft but only suited for moderate horsepower.
Aluminum weld yokes.

Pros: Light weight, never rust, and higher critical speed than steel shafts.
Cons: The weakest of all driveshafts.

Remember this is the same driveshaft used on applications such as the Astro van.



Metal Matrix Composite (MMC) – This is a unique high-performance aluminum with silicon, ceramic, and carbide added to the molten aluminum.
Where legal this is a great application for both circle track and drag racing.
Aluminum weld yokes.

Pros: Lightweight, very stiff torsional for aluminum, and very strong.
Cons: One of the more expensive materials but you get what you pay for.


Here’s a link to an aluminum driveshaft being welded at Dynothech


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