Muncie Super Duty M23 Super Case 4-speed Drag Racing Rock-Crusher.
Severe Duty M23 gearboxes feature enlarged steel ‘thrust button’ case assembled modular countershaft clusters with ground drive gears, unit cage needle bearings, integral countershaft spacer tubes and carbonitrided over sized synchronizer hubs. Slick Shift 18 spline hardened sliders. Small pad Crowned Steel Forks. Welded Shift Shafts. Forged Brass blocker rings. Main drive oil seal input shaft and bearing retainer. 34 tooth 1st super strong 1st gear (stronger that the M22 1st gear). C355 Forged Aluminum mid plate. Lightened main shaft for less rotating mass. The M23 is the strongest Muncie style 4-speed available.
Complete gear polishing available for road racing and serious competition; $100
M23 CLOSE RATIO, m23w WIDE RATIO AND m23z RATIO
GEAR POLISHING $150
MANY DIFFERENT RATIOS AVAILABLE. CALL JEFF FOR ALL THE DETAILS TO THIS SUPER SERVE DUTY M23.