David Brown Radicon Series M Inline Helical Gearbox 27.5:1 Ratio 64rpm 56C/140TCFrame Size: 56C 140TC Ratio: 27. 5: 1 Input RPM: 1750 Output RPM: 64 Input Shaft Diameter: Includes 5 8" bushing. You could also use a 7 8" bushing for a 140TC motor size Output Shaft Diameter: 1 1 4" Output Shaft Orientation: Inline Does gearbox include breather vent?: No In Good Used Condition, Removed from a Working Environment. Original tag is removed