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The Gear Box Transmissions
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Muncie Parts

 

We are still shipping Internationally but due to excessive delays at U.S. Postal Service, we are only shipping International orders via UPS International except for Canada.

EXPECT MAJOR DELAYS WITH USPS

 

Please do not specify USPS on checkout unless you are in Canada and want that option.

We also carry and sell Complete Do It yourself Super Muncie Kits. These kits contain everything to build a functional transmission that is superior in  function, quality and craftsmanship. Multiple ratios, Heavy Duty case, center plate and tail. Italian gear sets, roller bearing clusters, Heavy Duty shift plate (M23 Super Finish shown)

Currently on Backorder-looking for availability Spring 2024

 

The Muncie 4-speed manual transmission holds a significant place in automotive history, renowned for its robust design and pivotal role in the performance car era. Developed by General Motors (GM), the Muncie transmission became an icon of muscle cars during the 1960s and early 1970s, leaving an indelible mark on the automotive landscape.

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NEW Upgraded Muncie M20 4 speed $2158.00
NEW Upgraded Muncie M20 4 speed $2498.00

No Price

NEW Muncie M22 SUPER ROCK CRUSHER 4 speed $2399.00
NEW Muncie M22 SUPER ROCK CRUSHER 4 speed $2899.00

No Price

Muncie Overhaul Kit 1966-74
Muncie Overhaul Kit

Complete overhaul kit for Muncie 4 speed transmissions

Must specify if your transmission has a 1" or 7/8" cluster shaft (pin)

7/8" kit comes with NON stepped synchronizer rings

Please scroll down to order extras (cluster pin, wrench,sliders etc

From $122.95

Muncie Master Overhaul Kit
Muncie Master Overhaul Kit

The ultimate Master rebuild kit for Muncie transmissions!  

Only high quality parts in kit.

NOTE: This kit no longer includes the front bearing up grade kit. Please order separately.  

From $253.05

Muncie Heavy Duty Competition Overhaul kit 66-74
Muncie Heavy Duty Competition Overhaul kit 66-74

Heavy Duty Competition overhaul kit for Muncie 4 speed transmissions, 1966-1974.

1966-1974 Muncies have a 1 inch cluster shaft.

Please scroll down for extras (input nut wrench, cluster pin, synchronizer sliders etc)

From $207.25

Muncie Gasket Seal Bushing Kit 32 spline
Muncie Gasket Seal Bushing Kit 32 spline

This is a complete gasket, seal and bushing kit for all Muncie trasmissions, 1963-1974 with 32 spline. Everything is included to reseal a leaking transmission.

From $25.00

Muncie Gasket Seal Bushing Kit 27 spline
Muncie Gasket Seal Bushing Kit 27 spline

This is a complete gasket, seal and bushing kit for all Muncie trasmissions, 1963-1974 with 27 spline. Everything is included to reseal a leaking transmission.

$25.00

Muncie Gasket Set M20 M21 M22 1963 -1974
Muncie Gasket Set M20 M21 M22 1963 -1974

Complete Muncie gasket set for all Muncie transmissions.

From $7.70

Muncie Case
Muncie "SUPER" Case

This is the all new, redesigned replacement case for all Muncie M20, M21 & M22 transmissions 1963-74. Please specify pin size when order, and if you want Hardened front Thrust Button .

NOTE:IF YOU HAVE A '63 MODEL CALL BEFORE ORDERING. some 63 models use a smaller front bearing that will not fit this case

Just added NEW GM OE style cases casting number (3925660) 1968-70 1" style

From $314.27

Muncie Tailhousing with Reverse Lever 27 or 32 spline
Muncie Tailhousing with Reverse Lever 27 or 32 spline

This is an all new, re-designed Muncie aftermarket tailhousing manufactured by Auto Gear.

From $351.88

(NEW) Muncie Aluminum Mid Plate
(NEW) Muncie Aluminum Mid Plate

Muncie Billet Aluminuml Midplate. Will fit all Muncie transmissions, 1963 - 1974, M20, M21, M22.

$142.87

Muncie Bushed Side Cover Kit AUTO GEAR
Muncie Bushed Side Cover Kit

Muncie bushed side cover kit. Superior quality over the original OEM side cover. 

Available as 

AUTO GEAR

OR

HD BILLET ALUMINUM 

From $165.28

Muncie Synchronizer / Blocker Ring Standard or Heavy Duty 1963-65 or 1966-74
Muncie Synchronizer / Blocker Ring Standard or Heavy Duty 1963-65 or 1966-74

Muncie synchronizer / blocker ring will fit either:

From $7.15

Muncie Front Nut Wrench
Muncie Front Nut Wrench

Front nut wrench-is designed to ensure proper tightening of the front retaining nut on all Muncie M20, M21 & M22 transmissions.

$18.95

Muncie Front Retaining Nut
Muncie Front Retaining Nut

Muncie front retaining nut for all 1963-74 Muncie transmissions, M20, M21 & M22.

$8.88

Muncie Cluster Pin 7/8" or 1"
Muncie Cluster Pin 7/8" or 1"

Fits all Muncie transmissions with 7/8" or 1" cluster pin. You must specify which pin you need when purchasing.

From $24.95


1" CLUSTER PIN (FULL CASE LENGTH)

EXTRA LONG PIN TO FIT FLUSH WITH FRONT OF CASE

$31.50

Muncie Shift Fork
Muncie Shift Fork

Muncie shift fork for all Muncie transmissions, M20, M21, M22.

From $26.04

Muncie Reverse Shift Fork
Muncie Reverse Shift Fork

Muncie Reverse Shift fork fits all Muncie transmissions, 1963-74, M20, M21 & M22.

$24.45

Muncie Front Bearing Retainer Korean
Muncie Front Bearing Retainer Korean

Muncie front bearing retainer for all Muncie transmissions, M20, M21, M22.

$26.00

Muncie Front Bearing Retainer with Seal, Annodized Alumninum.
Muncie Front Bearing Retainer with Seal, Annodized Alumninum.

$123.56

Muncie Front Bearing Retainer Spacer
Muncie Front Bearing Retainer Spacer

Front bearing retainer spacer will allow you to use a standard 4-13/16" front bearing retainer and space it to work in a 5 1/8" truck style bell housing. Use JB Weld or Loctite to hold in place.

$29.67

Muncie Cluster Gear Bearing Kit 1966-1974
Muncie Cluster Gear Bearing Kit 1966-1974

Cluster gear bearing kit will fit all Muncie transmissions with a 1" cluster shaft.

$29.00

Muncie Bearings, Front or Rear
Muncie Bearings, Front or Rear

Front or rear bearing for all Muncie transmissions, 1963-74.

From $23.20

Muncie Front Bearing Upgrade Kit 1964-74
Muncie Front Bearing Upgrade Kit 1964-74

This kit will enable you to upgrade your Muncie front bearing to the much stronger & more durable USA Made 6307NR bearing, Japanese made Nachi sealed bearing or American Max Load Open Bearing. This will replace the narrower, less durable standard front bearing that came originally in this trans.

From $34.95

Muncie Caged Pocket Bearing with 17 rollers
Muncie Caged Pocket Bearing with 17 rollers

Caged Pocket bearing with 17 rollers for all 1963-74 Muncie transmissions, M20, M21 & M22.

From $11.89

Muncie Standard Slider 1963-1974 M20 M21 M22
Muncie Standard Slider 1963-1974 M20 M21 M22

Slider for all Muncie M20, M21 & M22 transmissions, 1963-1974.

$65.00

Muncie Torque Lock Slider 1963-1974 Italian
Muncie Torque Lock Slider 1963-1974 Italian

Muncie torque loc sliders, Italian made. Made off OE blueprints.

$59.82

Muncie Torque Lock Slider 1963-1974 Korean
Muncie Torque Lock Slider 1963-1974 Korean

Torque lock slider for all Muncie transmissions, M20, M21, M22, 1963-1974.

$39.95

Muncie Competition Race Designed Slider
Muncie Competition Race Designed Slider

Slider is a competition, race designed slider.

$125.73

Muncie Synchronizer Hubs 1-2 or 3-4
Muncie Synchronizer Hubs 1-2 or 3-4

Muncie synchronizer hubs for the 1-2 or the 3-4 synchronizer. 

From $32.50


MUNCIE 1/2 SYNCHRO ASSY (STANDARD SLIDER)

MUNCIE 1/2 HUB AND SLIDER SET (NON TORQUE LOCK) LESS RINGS, KEYS, SPRINGS

MUST USE LATE (STEPED) RINGS

$85.00


SYNCHRO ASSY 3/4, Non T/Loc,

MUNCIE 3/4 STANDARD HUB AND  SLIDER KIT (NON TORQUE LOCK) LESS KEYS, SPRINGS, RINGS

MUST USE LATE (STEPED) RINGS

$85.00

Muncie Synchronizer Assembly
Muncie Synchronizer Assembly

Muncie synchronizer assembly fits all Muncie transmissions, 1963 - 1974, M20, M21 & M22. 

From $74.10

Muncie Oil Slinger
Muncie Oil Slinger

Muncie front bearing oil slinger.

$3.95

Muncie Mainshaft 1st Gear Bushing
Muncie Mainshaft 1st Gear Bushing

Fits all Muncie transmissions, 1964-74 M20, M21, & M22. Auto Gear USA made or South Korean made.

This is an upgraded designed sleeve that provides better lubrication between the gear and the bushing.

From $30.00

Muncie 1st Gear 36 Tooth Auto Gear Italian or South Korean made
Muncie 1st Gear 36 Tooth Auto Gear Italian or South Korean made

Muncie 1st gear with 36 teeth fits all M20 & M 21 Muncie transmissions 1964-74.

From $82.00

Muncie M22 1st gear 36 tooth Italian or Korean
Muncie M22 1st gear 36 tooth Italian or Korean

1st gear with 36 teeth for all Muncie M22 close ratio transmissions.

From $109.00

Muncie M22 Rollerized 1st Gear
Muncie M22 Rollerized 1st Gear

Rollerized 1st gear, 36 tooth, for Muncie M22 transmissions, 1964-74. A rollerized 1st gear is a must in high load and high speed applications, such as road racing or circle track racing.
Does not fit Muncie M20 or M21. 

$155.00

Muncie 2nd Gear 30 Tooth Auto Gear Italian or South Korean Made
Muncie 2nd Gear 30 Tooth Auto Gear Italian or South Korean Made

Muncie 2nd gear with 30 teeth. Fits all M20 & M21 muncie transmissions.

From $76.07

Muncie M22 2nd gear 30 tooth Italian or Korean
Muncie M22 2nd gear 30 tooth Italian or Korean

2nd gear with 30 teeth for all Muncie M22 close ratio transmissions.

From $93.70

Muncie 3rd Gear 27 Tooth Auto Gear Italian or South Korean Made
Muncie 3rd Gear 27 Tooth Auto Gear Italian or South Korean Made

Muncie 3rd gear with 27 teeth fits all M20 & M21 muncie transmissions.

From $58.00

Muncie M22 3rd gear 27 tooth Italian or Korean
Muncie M22 3rd gear 27 tooth Italian or Korean

3rd gear with 27 teeth for all Muncie M22 close ratio transmissions.

From $90.60

Muncie Input / Main Drive M20 M21
Muncie Input / Main Drive M20 M21

Input / main drive with 10 spline for Muncie M20 or M21 transmissions.

Please specify which input you need when placing your order.

From $86.00

Muncie M22 Input Shaft 10 or 26 spline
Muncie M22 Input Shaft 10 or 26 spline

Input shaft for the Muncie M22 transmission. Available in either 10 or 26 spline.  9310 Steel

MUST CHECK TOOTH COUNTS

From $102.76

GM Pilot Bushing
GM Pilot Bushing

$19.80

Muncie Cluster Gear M20 M21 FOR 1" or 7/8" cluster pin
Muncie Cluster Gear M20 M21 FOR 1" or 7/8" cluster pin

Muncie cluster gear for 1963-65 (7/8" cluster pin) or 1966-74 (1" cluster pin) Muncie either M20 or M21.  

From $140.12

Muncie M20 Wide Ratio or M21 Close Ratio Gear Set
Muncie M20 Wide Ratio or M21 Close Ratio Gear Set

New Muncie M20 2.52 Wide Ratio OR M21 2.20 close ratio gear set.

M20 gearset also available in Italian 

From $419.00

Muncie M22 Rockcrusher Close, Wide and NEW Extra-Wide (2.98)  Ratio Gear Set - Italian or Korean mad
Muncie M22 Rockcrusher Close, Wide and NEW Extra-Wide (2.98) Ratio Gear Set - Italian or Korean made

 

New Muncie M22 2.20 close ratio,  2.52 wide ratio, or NEW 2.98  'Z' Ratio Rockcrusher gear set is availabe with either a 10 or 26 spline input. 

You must select whether you need a wide or close ratio & which input spline count, 10 or 26.

From $540.00

Muncie Mainshaft 27 Spline
Muncie Mainshaft 27 Spline

New Muncie Mainshaft 27 spline.

From $175.62

Muncie Mainshaft 32 Spline
Muncie Mainshaft 32 Spline

New Muncie Mainshaft 32 spline. Korean.

or,

new High-Strength, rifle-drilled/lightened 32 spline shaft with improved oil supply machining.

From $189.67

Muncie Reverse Idler Shaft
Muncie Reverse Idler Shaft

Muncie Reverse Idler Shaft fits all 1963-74 M20, M21, M22 transmissions.

$18.98

Muncie Reverse & Idler Gearset, Idler Gear or Reverse Gear Italian or Korean Made
Muncie Reverse & Idler or, Idler Gear, or Reverse Gear Italian or Korean Made

Muncie reverse and idler gear set or individual gears. 

From $54.00

Muncie Front Idler M20 M21 M22
Muncie Front Idler M20 M21 M22

 

Muncie M20, M21 18 tooth front idler. WT297-10

Muncie M22 18 tooth front idler WT 297-10B

From $33.97

Muncie Shift Lever Reverse
Muncie Shift Lever Reverse

Muncie shift lever for reverse

$51.37

Muncie Shift Lever 1-2 / 3-4
Muncie Shift Lever 1-2 / 3-4

Muncie shift lever for 1-2 or 3-4.

THESE ARE AUTO GEAR 1 (ONE) PIECE LEVERS

$77.62

Muncie LINKAGE ARM LEVER RETAINER ADAPTER
Muncie LINKAGE ARM LEVER RETAINER ADAPTER

$3.56

Muncie Detent Lever Pivot Pin
Muncie Detent Lever Pivot Pin

Muncie detent lever pivot pin will fit all Muncie transmissions, 1963-74 M20, M21, M22.

Replacement part allows you to correct & replace the early non retained side cover pivot pin. Also is a replacement for the later shouldered pin.

$8.78

Muncie Detent Levers (Set of 2)
Muncie Detent Levers (Set of 2)

Muncie detent levers (2) fits all Muncie transmissions, 1963-74 M20, M21, M22.

$19.50

Muncie Heavy Duty Detent Lever Spring
Muncie Heavy Duty Detent Lever Spring

Heavy duty detent lever spring for all Muncie transmissions, 1963-74, M20, M21, M22.

$3.80

Muncie Reverse Lever Detent Ball & Spring
Muncie Reverse Lever Detent Ball & Spring

Ball & spring for Muncie reverse lever detent.

Ball part #453593

Spring part # 3773017

$4.85

Muncie Bolt Kit
Muncie Bolt Kit

Muncie bolt kit includes all bolts for Muncie transmissions. 21 bolts are included.

  • side cover bolts
  • tailhousing bolts
  • front bearing retainer bolts for early & late applications

$13.49

Muncie French Locks
Muncie French Locks

Pair of french locks for the front of all Muncie transmission that secure the four front bearing retainer bolts.

$3.99

Muncie Billet Keys

$41.00

Muncie Synchronizer Key & Spring Set
Muncie Synchronizer Key & Spring Set

Synchronizer key & spring set for all Muncie transmissions. Includes 3 keys & 2 springs.

$4.75

Muncie Reverse Lever Tapered Pin
Muncie Reverse Lever Tapered Pin

Muncie reverse lever tapered pin for retaining reverse lever shaft & tailhousing.

$1.79

Muncie Small Parts Kit 1963-65 or 1966-74
Muncie Small Parts Kit 1963-65 or 1966-74

 

Small parts kit for 1963-65 or 1966-74 Muncie transmissions.

From $23.59


SP297-60 muncie external small parts kit

EXTERNAL SMALL PARTS WITH KEYS AND SPRINGS

$28.61

Muncie Tailhousing Bushing 27 or 32 spline
Muncie Tailhousing Bushing 27 or 32 spline

Tailhousing bushing for 27 or 32 spline Muncie transmissions.

From $5.25

Muncie Side Cover Seal
Muncie Side Cover Seal

One side cover seal for all Muncie transmissions.

$2.80

Muncie Rear Seal 27 or 32 spline
Muncie Rear Seal 27 or 32 spline

Rear Seal for 27 or 32 spline Muncie transmissions.

From $3.25

Upgraded Steel Bushings & Linkage Clips
Upgraded Steel Bushings & Linkage Clips

Upgraded Steel Bushings & Linkage Clips for Muncie, T10, Super T10 & Toploader transmissions.

$14.75

Speedometer Housing
Speedometer Housing

Solid steel speedo housing comes with seal and O ring.

$9.95

Speedo Housing Tab & Bolt
Speedo Housing Tab & Bolt

Tab & bolt for GM Speedo housing. Fits T5, T10, Super T10, Saginaw, Muncie GM applications. Includes metric & American bolt, depending on application.

$4.50

Muncie speedo gear clip
Muncie speedo gear clip

Speedo gear clip for Muncie transmissions with plastic drive gear.

$2.50

Muncie Steel Speedo Drive Gear 1.84 OD 7T or 8T  27 or 32 spline output
Muncie Steel Speedo Drive Gear 1.84 OD 7T or 8T 27 or 32 spline output

Muncie steel drive gear with 7 OR 8 teeth. Will fit either the 27 spline or 32 spline output shaft.

From $31.29

Speedometer Driven Gears
Speedometer Driven Gears

New OEM AC Delco gears are used in Muncie, GM T10, GM Super T10, Saginaw 3 & 4 speed, GM T5, Powerglide, 200 & 350 transmissions.

From $18.00

TransJel Transmission Assembly Lube
Asemblee goo Transmission Assembly Lube

 Assembly Lube for all  manual transmissions. Lubricates and holds needle bearings & thrust washers during assembly. Remains smooth and blends with all  manual transmission fluids. One pound tub.

NOTE: (TRANSJEL) IS NOW ASEMBLEE GOO  BLUE NOT RED AS IN PICTURE

$17.95

80w90 MULTI PURPOSE PETROLEUM GEAR OIL GL4 SPEC
80w90 MULTI PURPOSE PETROLEUM GEAR OIL GL4 SPEC

$11.25

Ultra RTV Sealant
Ultra RTV Sealant

$8.72

DRAIN PLUG, 1/2"-14 W/ MAGNET
DRAIN PLUG, 1/2"-14 W/ MAGNET

Drain/ Fill Plud, w/ Magnet

$6.54

Muncie M22 Cluster Gear
Muncie M22 Cluster Gear

close ratio  cluster gear for Muncie M22 transmissions. 

From $169.00

The Muncie 4-speed manual transmission holds a significant place in automotive history, renowned for its robust design and pivotal role in the performance car era. Developed by General Motors (GM), the Muncie transmission became an icon of muscle cars during the 1960s and early 1970s, leaving an indelible mark on the automotive landscape.

 

In 1965, GM introduced an even more robust version of the Muncie transmission, known as the M22 or "Rock Crusher." This transmission, with its distinctive whine, became synonymous with high-performance cars of the era. The M22 featured straighter cut gears, providing a more aggressive gear mesh for increased strength and durability. The Rock Crusher earned its name from the audible noise it produced, resembling the crushing of rocks, and it quickly gained popularity among drag racers and street racers alike.