Designed and built for your classic ‘muscle’ car. This gearbox is the strongest and fastest-shifting synchronized manual transmission on the market.

Exclusive AutoGear features and benefits:
(1) ‘Muncie’ installation footprint: reuse your existing clutch, shifter and driveshaft
(2) three available first gears supporting 36 gearsets. Put gears where you want them for street, strip or track, regardless of your application or driving style
(3) legendary ‘Masiero’ Italian gears, rarely equaled, never bested
(4) ‘N-series’ case system and mainshaft assembly, ready for today’s power
(5) AutoGear exclusive ‘controlled-clearance’, lug-indexed synchronizer assemblies, the fastest-shifting and most durable available
(6) Japanese Kyowa synchronizer rings, the most accurate and strongest ever offered for a ‘Muncie’-based transmission
(7) oil-sealed ‘torsion-cushioned’ 26 spline inputs for maximum strength and shock tolerance
(8) Housing, extension, endplates, and midplates cast and machined in the US with aircraft grade aluminum.

The N-series foundation; with the AutoGear exclusive SAE 9310-equivalent, modular countershaft, stronger 1st gear geometry and polished gears.

  • 36 different ratios (Contact us for help)
  • 10- or 26-spline input
  • 27- or 32-spline output
  • AutoGear designed “Roller 1st” or polished and grooved 1st gear bushing
  • 7- or 8- tooth speedometer gear (passenger side only)
  • Suitable for muscle cars, hotrods and classics that need enhanced durability or a more customized experience
  • Suitable for most dedicated track use, typically under 700hp/tq – contact us for details
  • Each M23 is custom built to order.

Not sure which ‘Syracuse’ you need? Submit an ‘EZ-Spec’. We’ll respond with a personalized recommendation.

Our Pledge? To be the best today and better tomorrow. We are humbled by your confidence.


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