M21 M22 4 Speed Muncie Manual Transmission

Having issues diagnosing problems with your M21 M22 4 Speed Muncie Manual Transmission? we can help.

Below you will find a detailed parts list for the M21 & M22 manual transmission that includes complete rebuilt transmissions bearing rebuild kits with and without synchro rings, gaskets and seals, small parts kits, bushings, individual bearings, slider, synchro rings, forks, gears and shafts. Also available are cover and case and Miscellaneous parts. If you need more information or cannot find the parts you need give us a call, if you would like to save money, ask about our good take out parts (GTO), they are inspected and guaranteed.

We have a large inventory of rebuilt M21 & M22 Manual Transmissions plus transmission parts. Our factory rebuilt re-manufactured transmissions are dyno tested before leaving the factory, ensuring the highest quality, We offer a no hassle 12 month warranty, performance guaranteed. The M21 & M22 is a four speed, RWD or 4WD transmission. The M21 & M22 is a Muncie engineering design, this transmission is aluminum case, extension housing and side cover. The side cover has seven bolts and two shift cams. The synchro rings have 35 teeth and the unit has a 4 step cluster gear. The reverse gears are helical cut and are located in the extension housing.

Free M21 & M22 5 Manual Transmission Speed Parts Illus.

Below we provide a M21 & M22 parts illustration to assist you with the correct identification of the parts you need. Select the parts you require from the following list and give us a call. One of the most common problems is rough bearing failure noise coming from the front of the transmission clutch area. This is generally caused by pilot bearing failure that generally damages the input shaft.

See the complete line of products that we offer at www.midwesttrans.com. To speak to a Drive Train Expert or to place an order call toll free 888-824-2012!

Application Description Model Years

S10 Blazer & Pickup 27 spline input, 32 spline rear output 1992-1997

Dakota 23 spline input, 32 spline rear output 2000-2001

Need Stronger Parts?

Midwest Transmission can Cryogenic Treat any shaft or gear. This cryo treatment will add 30% in component strength. Call 888-824-2012 for a quote.

Rebuilt Dyno Tested M21 & M22 Transmissions 12 month warranty

Description Part Number

Rebuilt Transmission 1966-1974 M21 27 Spline MTGM016

Rebuilt Transmission M22 1966-1974 Rock Crusher MTGM038

Rebuilt Overhaul Bearing Kits M21 & M22 Transmission

Kits w/OE Style Bearings

Drawing Image Description Part Number

N.I. M20 (63-65) (72mm OD Input Bearing) TRSBK117A

N.I. M20 (63-65) (80mm OD Input Bearing)*HD Kits Available MWT-117

N.I. M21 M22 (66-74) (7/8″ Dia. Counter Shaft Pin) *HD Kits Available MWT-117

N.I. M21 M22 (66-74) (1″ Dia. Counter Shaft Pin)*HD Kits Available MWT-116

*HD Kits Available w/Max load Bearings

Drawing Image Description Part Number

N.I. M20 (63-65) (80mm OD Input Bearing) TRSBK117HD

N.I. M21 M22 (66-74) (7/8″ Dia. Counter Shaft Pin) TRSBK117HD

N.I. M21 M22 (66-74) (1″ Dia. Counter Shaft Pin) MWTBK116HD

Bearing Kits

Kits w/OE Style Bearings & Syncro Rings

Drawing Image Description Part Number

N.I. M20 (63-65) (72mm OD Input Bearing) TRSBK117A

N.I. M20 (63-65) (80mm OD Input Bearing)*HD Kits Available TRSBK117WS

N.I. M21 M22 (66-74) (7/8″ Dia. Counter Shaft Pin) *HD Kits Available TRSBK117WS

N.I. M21 M22 (66-74) (1″ Dia. Counter Shaft Pin)*HD Kits Available TRSBK116WS

*HD Kits Available w/Max load Bearings

Drawing Image Description Part Number

N.I. M20 (63-65) (80mm OD Input Bearing) TRSBK117HDWS

N.I. M21 M22 (66-74) (7/8″ Dia. Counter Shaft Pin) TRSBK117HDWS

N.I. M21 M22 (66-74) (1″ Dia. Counter Shaft Pin) TRSBK116HDWS

Gaskets & Seal Kits M21 & M22 Transmission

Kits w/OE Style Bearings

Drawing Image Description Part Number

N.I. Gasket Kit GS297-55

Gaskets

Drawing Image Description Part Number

N.I. Gasket, Bearing Retainer TRS304301

Seals

Drawing Image Description Part Number

79 Shifter Seal MWT100281

58 Rear Seal (27 Spline Main Shaft) TRS44074

58 Rear Seal (32 Spline Main Shaft) TRS34074

31 Spacer Tube (Fits 1″ Counter Shaft) TRS3912195

Tapered Roll Pin TRS304485

Small Parts Kit M21 & M22 Transmission

Drawing Image Description Part Number

N.I. Small Parts Kit (7/8″ OD Counter Shaft) (M20) SP297-50

N.I. Small Parts Kit (1″ OD Counter Shaft) (M21 M22) SP297-50

N.I. Transmission Conversion Kit (Complete) (M21 to M22) TRS331066

Washers

Drawing Image Description Part Number

Cluster Thrust Washer TRS3864860

Bushings Extension Housing M21 & M22 Transmission

Drawing Image Description Part Number

44 1st Gear TRS18-103-001

57 Extension Housing (1.630″ OD) 35008

57 Extension Housing (2.010″ OD) 100408

Washers

Drawing Image Description Part Number

Cluster Thrust Washer TRS3864860

Bearings M21 & M22 Transmission

Drawing Image Description Part Number

10 Input Bearing (Standard) N307LOE

10 Input Bearing (Heavy Duty) N1307-L

N.I. Input Bearing Slinger TRSSP835

47 Rear Main Shaft Bearing (40mm ID, 23mm Thick, 90mm OD) TRS6308-N

47 Rear Main Shaft Bearing (40mm ID, 23mm Thick, 90mm OD) Max load TRSM6308N

Pocket Needle Bearing (w/Cage) JV441419

Input Needle Bearing no cage JV441419-N

Sliders M21 & M22 Transmission

Drawing Image Description Part Number

36A Slider, 1-2 & 3-4 (Torque Lock Type) T10-15

Syncro Assemblies & Rings M21 & M22 Transmission

Drawing Image Description Part Number

57 Extension Housing (1.630″ OD) WT266-62A

Synchronizer Kits

Drawing Image Description Part Number

M20 Syncro Ring Kit TRSSRK117

M21 Syncro Ring Kit TRSSRK116

M22 Syncro Ring Kit TRSSRK116

Synchronizer Components

Drawing Image Description Part Number

41 1-2 Synchro Assembly (Complete) AWT297-80A

36, 37 1-2 Synchro Key & Spring Kit WT297-K

35 1-2 Synchro Ring (Early, Non-Stepped Shoulder) WT297-14

35 1-2 Synchro Ring (Late, Stepped Shoulder) WT297-14A

38 3-4 Synchro Assembly (Complete) AWT297-2.5A

36, 37 3-4 Synchro Key & Ring Spring Kit TRS304701-2K

35 3-4 Synchro Ring (Early, Non-Stepped Shoulder) WT297-14

35 3-4 Synchro Ring (Late, Stepped Shoulder) WT297-14A

36, 37 Synchro Key 1-4 TRS304701-2

Shift Forks M21 & M22 Transmission

Drawing Image Description Part Number

17 1-2 & 3-4 Shift Fork WT297-23

17 Reverse Fork WT297-23A

Gears M21 & M22 Transmission

Drawing Image Description Part Number

43 1st Gear (36 T) M21 (63) WT297-12

43 1st Gear (36 T) (Except M22) (64-74) WT297-12A

43 1st Gear (36 T) (M22) (64-74) WT297-12B

43 1st Gear (M20), (M21), (M22) WT297-36

52 2nd Gear (30 T) (Except M22) (63-74) WT297-21

52 2nd Gear (30 T) (M22) (63-74) WT297-21A

39 3rd Gear (27 T) (Except M22) (63-74) WT297-11

39 3rd Gear (27 T) (M22) (63-74) WT297-11A

52 Reverse Gear (35 T) (63-74) WT297-36

52 Reverse Gear (40 T) (63-74) TRS290-36A

73 Front Idler Gear (Except M22) 304819B

73 Front Idler Gear (M22) TRSWT297-10B

73 Reverse Idler Gear (27 T) 27 Spline AWT297-10A

67 Reverse Idler Shaft TRSWT297-35

Gear Kits
(Close Ratio = 26T Input Shaft, Wide Ratio = 21T or 24T Input Shaft)

Drawing Image Description Part Number

N.I. M20 (10 Spline, 7/8″ Counter Shaft) Wide Ratio 2.56 1st Gear TRSGK-M20

N.I. M20 (10 Spline, 1″ Counter Shaft) Wide Ratio 2.52 1st Gear TRSGK-M20A

N.I. M20 (26 1″ Counter Shaft) Wide Ratio 2.42 1st Gear TRSGK-M20B

N.I. M21 (10 Spline 7/8″ Counter Shaft) Close Ratio 2.20 1st Gear GK-M21

N.I. M21 (10 Spline 1″ Counter Shaft) Close Ratio 2.20 1st Gear TRSGK-M21A

N.I. M21 (26 Spline 1″ Counter Shaft) Close Ratio 2.20 1st Gear TRSGK-M21B

N.I. M22 (1st Gear Kit) Updated Incl. Gear, Spacer, Bushing, Bearing TRS18-410-014

N.I. Gear Conversion Kit (M21 to M22) w/ 10 Spline Input GK-M22

N.I. Gear Conversion Kit (M21 to M22) w/ 26 T & 26 Spline Input Shaft TRSGK-M22A

N.I. Gear Conversion Kit (M21 to M22) W/ 21 T & 26 Spline Input Shaft TRSGK-M22B

Input, Main & Counter Shafts M21 & M22 Transmission

(Close Ratio + 26T Input Shaft, Wide Ratio = 21T or 24T Input Shaft)

Drawing Image Description Part Number

13 Input Shaft (21 T) 10 Spline (66-70) (Wide Ratio) AWT297-16B

13 Input Shaft (21 T) 26 Spline (71-74) (Wide Ratio) AWT297-16C

13 Input Shaft (24 T) 10 Spline (63-65) (Wide Ratio) AWT297-16A

13 Input Shaft (26 T) 10 Spline (Except M22) (Close Ratio) AWT297-16

13 Input Shaft (26 T) 10 Spline (M22) (66-77) AWT297-16U

13 Input Shaft (26 T) 10 Spline (M22) (66-77) AWT297-16U

13 Input Shaft (26 T) 26 Spline (Except M22) (71-74) (Close Ratio) AWT297-16D

13 Input Shaft (26 T) 26 Spline (M22) AWT297-16F

42 Main Shaft (27 Spline) WT297-2A

42 Main Shaft (32 Spline) WT297-2B

42 Main Shaft (32 Spline) TRSWT297-2G

30 Cluster Shaft (M20) (27-22-19-17) Close Ratio (63-65) WT297-8

30 Cluster Shaft (M20) (29-22-19-17) Wide Ration (63-65) WT297-8A

30 Cluster Shaft (M21) (25-22-19-17) Wide Ratio (66-74) AWT297-8C

30 Cluster Shaft (M21) (27-22-19-17) Close Ratio (66-74) WT297-8D

30 Cluster Shaft (M22) (27-22-19-17) Close Ratio (66-74) WT297-8E

31 Counter Shaft (7/8″ OD) (M20) WT297-3

31 Counter Shaft Pin (1″ OD) (M21) WT297-3A

67 Reverse Idler Shaft TRSWT297-35

Case & Cover M21 & M22 Transmission

Drawing Image Description Part Number

11 Case (7/8″ OD Counter Shaft) (M20) TRS18-410-001

11 Case (1″ OD Counter Shaft) (M21) TRS18-410-002

55 Extension Housing (27 Spline Main Shaft) (Pass. Side Speedo) TRS18-410-021

55 Extension Housing (32 Spline Main Shaft) TRS18-410-022

Covers

Drawing Image Description Part Number

Side Cover Kit (3/8″ External Threads) 304756K

Side Cover Kit (3/8″ Internal Threads) TRS18-410-023

Side Cover Shift Lug. 1-2 & 3-4 (Bolt Type) TRS18-598-005

Cover (Center Support) (Iron) TRS18-672-001

Miscellaneous Parts M21 & M22 Transmission

Drawing Image Description Part Number

Detent Ball, Reverse TRS453593

Detent Spring, Reverse TRST8B-42

Drive Speedometer Gear (8 T) 1.18″ ID, 1.76″ OD TRS3708145

Drive Speedometer Gear (8 T) 1.18″ ID, 1.84″ OD TRS3708144

Drive Speedometer Gear (8 T) 1.41″ ID, 1.84″ OD 3978758

3 Front Retainer WT297-6

Input Nut GM591150

N.I. Input Nut Wrench WT297-W

Lug. Reverse (External Threads) TRS18-598-002-1X

Lug. Reverse (Internal Threads) TRS18-598-006

31 Spacer Tube (Fits 1″ Counter Shaft) TRS3912195

Tapered Roll Pin TRS304485