Input Bearing for Muncie M20 M21 M22 Transmission 1963-Up

Standard front input shaft bearing for GM Muncie M20, M21, and M22 four-speed manual transmissions. Reference OEM/interchange part number N307LOE when matching this bearing to your transmission rebuild.

Part Details

• Part type: Front input shaft bearing

• Transmission application: Muncie M20, M21, M22 four-speed manual transmission

• Fitment range: 1963-up Muncie transmission applications

• Reference number: N307LOE

• Duty level: Standard duty, not heavy duty

• Approximate bore: 35 mm / 1.38 in

• Approximate outside diameter: 80 mm / 3.15 in

• Approximate width: 17 mm

Repair And Fitment Guidance

The front input bearing supports the Muncie transmission input shaft and is commonly replaced during a complete manual transmission rebuild when the original bearing shows roughness, noise, looseness, wear, or damage.

Confirm the transmission is a Muncie M20, M21, or M22 and compare the removed bearing’s dimensions, configuration, and retention features before purchase. Muncie transmission cases, shafts, and components changed over production years, so vehicle make and year alone should not be used as the only fitment check.

This item is a standard-duty input bearing. Confirm your build does not require a heavy-duty alternative before installation.

Service Recommendations

Inspect the input shaft, bearing retainer, seal, synchronizers, gears, and transmission case while the unit is disassembled. Refill with the correct manual-transmission lubricant specified for the application. Lubegard ATF should only be used where compatible with the fluid being serviced and according to its product directions.