‘Syracuse’ M23: The Champion, Reimagined
The Muncie M23 is the strongest, fastest-shifting synchronized 4-speed on the market — purpose-built for musclecars, hot rods, and custom performance applications.
Whether you’re building a street legend or a track machine, the M23 delivers unmatched durability and shift feel — all in the classic Muncie footprint.
Why Choose the M23?
- ✅ Smooth shifting, optimized RPM drop
- ✅ Supercase standard with SAE 9310-equivalent countershaft
- ✅ Stronger gear geometry + polished contact surfaces
- ✅ SCCA-approved options available
- ✅ AutoGear “controlled-clearance” synchronizers for fast, durable shifts
Gear Ratio Packages
| Model | 1st Gear | 2nd Gear | 3rd Gear | 4th Gear | Best For |
|---|---|---|---|---|---|
| M23X | 2.20 | 1.64 | 1.27 | 1.00 | Road course & high-rev builds |
| M23W | 2.56 | 1.75 | 1.36 | 1.00 | Street/track blend |
| M23Z | 2.98 | 2.04 | 1.46 | 1.00 | Drag & street torque builds |
Additional ratio codes available (314, 324, 334, etc.) — Contact us to find your match.
What You Get
- ‘Muncie’ install footprint — reuse clutch, shifter, driveshaft
- Masiero Italian gears — rarely equaled, never bested
- N-Series Supercase + mainshaft = rugged and vibration-resistant
- Controlled-clearance synchros + Kyowa rings = built for fast shifts under pressure
- Oil-sealed, torsion-cushioned 26-spline inputs for torque shock protection
- Cast and machined in the USA with aircraft-grade aluminum
Resources
View documents and resources related to this gearbox in the resource center.
View ResourcesNot Sure Which Ratio Is Right?
Submit an EZ-Spec and our team will reply with a personalized recommendation.
Our mission? To be the best today — and better tomorrow.