Gears and Gearsets

Muncie 4 Speed OVERDRIVE Gear Kit (M21 ONLY)

Here it is! This will give your current M21 Muncie 4 speed 13% OVERDRIVE. That's right 13%, but it's for M21 only as there is not room in the case for any other ratio. If you don't currently have an M21, no problem, we stock brand new input shafts to go with this kit so you can get that Muncie into OVERDRIVE, check in this online store, they are for sale here! This gear set, as with all of our gear sets, is the finest available, they come from Auto Gear Co. in New York, the most respected name in the business. This set replaces your current cluster gear, 2nd gear and 3rd gear with new ratios for optimum performance. Ratios are as follows, 1st gear 2.20:1, 2nd gear 1.50:1, 3rd is 1 to 1, 4th position becomes .87 for a final of 13% overdrive out the tailshaft. As with all of our parts, technical assistance, as well as installation, is available from customer service at 877-614-4327.