J2 Fabrication 370A Extreme Plus 2013+ 6.6L Duramax


The J2Fab 6 phase hairpin alternator is our premium offering.  Rated at 370A, these 6phase units offer greater idle performance with a higher efficiency than other units available for your GM Truck.


  • 100% new components and direct bolt in case.
  • OEM Denso Regulator
  • Custom rotor/stator to decrease air gap to improve idle output.
  • Balanced rotor and 0 run-out slip rings to improve unit life and eliminate battery light flicker.
  • Heavy duty 12-80A diode twin rectifier plates
  • Improved air flow to ensure long service life in severe conditions
  • NTN premium and NSK USA bearings.


Overdrive pulley options available and only recommended for non-performance oriented vehicle applications.  Best suited for car audio builds.
If you select custom powdercoat colors – please remember to add your desired color into your order comments.  No Candies.

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Additional information

Weight 17 lbs
Dimensions 12 × 12 × 12 in

Matte Black, Wrinkle Black, Custom Color, None

OverDrive Pulley

Yes, No


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