Drivetrain› Manual Transmissions and Components

Yukon Gear & Axle

Yukon Gear 63-65 Muncie M20/M21 M/T w/SynchroS Bearing Kit

$251.89

SKU: Y001 ZMBK117WS

Special Order
Special Order
Ships in 4–6 weeks
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Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Advanced — 4+ hours

Description

This is a bearing kit for Muncie M20 and M21 manual transmissions from 1963-1965, specifically for 4-speed transmissions with synchros. It is designed for full rebuilds or standard maintenance to ensure smooth vehicle operation. Yukon Gear & Axle emphasizes quality parts, exceeding expectations through in-house engineering and rigorous testing.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandYukon Gear & Axle
Part NumberY001 ZMBK117WS

Videos

How to Rebuild a Muncie 4 Speed Synchronizer Basics

How to Rebuild a Muncie 4 Speed Synchronizer Basics
How to rebuild a Muncie 4 Speed - Tip #4 M22W Gearset Installation

How to rebuild a Muncie 4 Speed - Tip #4 M22W Gearset Installation
Muncie 4 Speed M20 M21 M22 Transmission Gaskets and Seals

Muncie 4 Speed M20 M21 M22 Transmission Gaskets and Seals
Rebuilding a Muncie M20 Transmission 4 Speed Gearbox

Rebuilding a Muncie M20 Transmission 4 Speed Gearbox
Quick Tip - Muncie 4 Speed Transmission Bearing Retainer Gaskets

Quick Tip - Muncie 4 Speed Transmission Bearing Retainer Gaskets
Muncie M20 Wide Ratio 4 Speed Transmission Rebuild

Muncie M20 Wide Ratio 4 Speed Transmission Rebuild
4 speed Muncie install

4 speed Muncie install
Muncie 4 Speed with OEM Muncie Shifter

Muncie 4 Speed with OEM Muncie Shifter
[How To] Rebuild a Muncie Transmission - ft. Muncie M21

[How To] Rebuild a Muncie Transmission - ft. Muncie M21
How To Rebuild a Muncie 4 Speed - Installing Needle Bearings

How To Rebuild a Muncie 4 Speed - Installing Needle Bearings

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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