M21 & M22 4 Speed Muncie Chevrolet & GM Rebuilt Manual Transmissions - Buy Factory Direct and Save Money!

Having issues diagnosing problems with your M21 & M22 GM 4 Speed manual transmission we can help.

m20, m21, m22 4 speed manual transmission

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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.

Select this link to see what models that used this 4 Speed transmission.

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!

Applications Model Years
Chevrolet 4 Speed 27 Spline 1964-1967
Chevrolet & GMC Rock-crusher 1966-1974

Need Stronger Parts?

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

sm465 bearing rebuild kit

Rebuilt Dyno Tested M21 & M22 Transmissions 12 month warranty

M20, M21 M22.
Description
Part Number
Your Cost
Rebuilt Transmission 1966-1974 M21 27 Spline
MTGM016 $1,200.00
Rebuilt Transmission M22 1966-1974 Rock Crusher
MTGM038 $1,666.67
Core Deposit for Above
$500.00

Rebuilt Overhaul Bearing Kits M21 & M22 Transmission

Illus. #
Description Part Number Your Cost
Kits w/OE Style Bearings
N.I.
M20 (63-65) (72mm OD Input Bearing) TRSBK117A $75.75
N.I.
M20 (63-65) (80mm OD Input Bearing)*HD Kits Available MWTBK117 $102.70
N.I.
M21 M22 (66-74) (7/8" Dia. Counter Shaft Pin) *HD Kits Available MWTBK117 $102.70
N.I.
M21 M22 (66-74) (1" Dia. Counter Shaft Pin)*HD Kits Available MWTBK116 $84.93
*HD Kits Available w/Max load Bearings
N.I.
M20 (63-65) (80mm OD Input Bearing) TRSBK117HD $129.92
N.I.
M21 M22 (66-74) (7/8" Dia. Counter Shaft Pin) TRSBK117HD $129.92
N.I.
M21 M22 (66-74) (1" Dia. Counter Shaft Pin) MWTBK116HD $160.96
Bearing Kits
Kits w/OE Style Bearings & Syncro Rings
N.I.
M20 (63-65) (72mm OD Input Bearing) TRSBK117AWS $117.97
N.I.
M20 (63-65) (80mm OD Input Bearing)*HD Kits Available TRSBK117WS $137.97
N.I.
M21 M22 (66-74) (7/8" Dia. Counter Shaft Pin) *HD Kits Available TRSBK117WS $137.97
N.I.
M21 M22 (66-74) (1" Dia. Counter Shaft Pin)*HD Kits Available TRSBK116WS $136.96
*HD Kits Available w/Max load Bearings
N.I.
M20 (63-65) (80mm OD Input Bearing) TRSBK117HDWS $324.94
N.I.
M21 M22 (66-74) (7/8" Dia. Counter Shaft Pin) TRSBK117HDWS $324.94
N.I.
M21 M22 (66-74) (1" Dia. Counter Shaft Pin) TRSBK116HDWS $262.92

Gaskets & Seal Kits M21 & M22 Transmission

Illus. #
Description Part Number Your Cost
N.I.
Gasket Kit MWTGS297-55 $7.93
Gaskets
N.I.
Gasket, Bearing Retainer TRS304301 $2.93
Seals
79
Shifter Seal MWT100281 $1.93
58
Rear Seal (27 Spline Main Shaft) TRS44074 $1.97
58
Rear Seal (32 Spline Main Shaft) TRS34074 $4.13
31
Spacer Tube (Fits 1" Counter Shaft) TRS3912195 $5.95
Tapered Roll Pin TRS304485 $17.97

Small Parts Kit M21 & M22 Transmission

Illus. #
Description Part Number Your Cost
N.I.
Small Parts Kit (7/8" OD Counter Shaft) (M20) MWTSP297-50 $33.98
N.I.
Small Parts Kit (1" OD Counter Shaft) (M21 M22) MWTSP297-50A $29.93
N.I.
Transmission Conversion Kit (Complete) (M21 to M22) TRS331066 $4.94
Washers
Cluster Thrust Washer TRS3864860 $3.93

Bushings Extension Housing M21 & M22 Transmission

44
1st Gear TRS18-103-001 $56.96
57
Extension Housing (1.630" OD) 35008 $10.00
57
Extension Housing (2.010" OD) 100408 $10.00
Washers
Cluster Thrust Washer TRS3864860 $3.93

Bearings M21 & M22 Transmission

Illus. #
Description Part Number Your Cost
10
Input Bearing (Standard) TRSN307LOE $27.97
10
Input Bearing (Heavy Duty) TRSN1307L $65.95
N.I.
Input Bearing Slinger TRSSP835 $3.93
47
Rear Main Shaft Bearing (40mm ID, 23mm Thick, 90mm OD) TRS6308-N $15.95
47
Rear Main Shaft Bearing (40mm ID, 23mm Thick, 90mm OD) Max load TRSM6308N $36.96
Pocket Needle Bearing (w/Cage MWTJV441419 $14.00
Input Needle Bearing no cage MWTJV441419-N $14.00

Sliders M21 & M22 Transmission

Illus. #
Description Part Number Your Cost
36A
Slider, 1-2 & 3-4 (Torque Lock Type) TRST10-15 $21.95

Syncro Assemblies & Rings M21 & M22 Transmission

Illus. #
Description Part Number Your Cost
57
Extension Housing (1.630" OD) TRSWT266-62 $2.92
Synchronizer Kits
M20 Syncro Ring Kit TRSSRK117 $26.96
M21 Syncro Ring Kit TRSSRK116 $26.96
M22 Syncro Ring Kit TRSSRK116 $26.96
Synchronizer Components
41
1-2 Synchro Assembly (Complete) MWTAWT297-80A $144.49
36, 37
1-2 Synchro Key & Spring Kit MWTWT297-K $7.97
35
1-2 Synchro Ring (Early, Non-Stepped Shoulder) MWTWT297-14 $11.33
35
1-2 Synchro Ring (Late, Stepped Shoulder) TRSWT297-14A $2.92
38
3-4 Synchro Assembly (Complete) MWTAWT297-2.5A $133.93
36, 37
3-4 Synchro Key & Ring Spring Kit TRS304701-2K $4.94
35
3-4 Synchro Ring (Early, Non-Stepped Shoulder) TRSWT297-14 $8.98
35
3-4 Synchro Ring (Late, Stepped Shoulder) TRSWT297-14A $4.94
36, 37
Synchro Key 1-4 TRS304701-2 $4.94

Shift Forks M21 & M22 Transmission

Illus. #
Description Part Number Your Cost
17
1-2 &3-4 Shift Fork MWTWT297-23 $44.00
17
Reverse Fork TRSWT297-23A $29.97

Gears M21 & M22 Transmission

Illus. #
Description Part Number Your Cost
43
1st Gear (36 T) M21 (63) MWTWT297-12 $144.94
43
1st Gear (36 T) (Except M22) (64-74) MWTWT297-12A $112.00
43
1st Gear (36 T) (M22) (64-74) MWTWT297-12B $166.96
43
1st Gear (M20), (M21), (M22) MWTWT297-36 $118.98
52
2nd Gear (30 T) (Except M22) (63-74) TRSWT297-21 $64.94
52
2nd Gear (30 T) (M22) (63-74) MWTWT297-21A $140.90
39
3rd Gear (27 T) (Except M22) (63-74) MWTWT297-11 $73.93
39
3rd Gear (27 T) (M22) (63-74) MWTWT297-11A $140.93
52
Reverse Gear (35 T) (63-74) MWTWT297-36 $118.98
52
Reverse Gear (40 T) (63-74) TRS290-36A $48.98
73
Front Idler Gear (Except M22) 304819B Call
73
Front Idler Gear (M22) TRSWT297-10B $45.95
73
Reverse Idler Gear (27 T) 27 Spline MWTAWT297-10A $60.90
67
Reverse Idler Shaft TRSWT297-35 $15.35
Gear Kits
(Close Ratio = 26T Input Shaft, Wide Ratio = 21T or 24T Input Shaft)
N.I.
M20 (10 Spline, 7/8" Counter Shaft) Wide Ratio 2.56 1st Gear TRSGK-M20 $606.96
N.I.
M20 (10 Spline, 1" Counter Shaft) Wide Ratio 2.52 1st Gear TRSGK-M20A $607.97
N.I.
M20 (26 1" Counter Shaft) Wide Ratio 2.42 1st Gear TRSGK-M20B $610.90
N.I.
M21 (10 Spline 7/8" Counter Shaft) Close Ratio 2.20 1st Gear TRSGK-M21 $603.93
N.I.
M21 (10 Spline 1" Counter Shaft) Close Ratio 2.20 1st Gear TRSGK-M21A $608.90
N.I.
M21 (26 Spline 1" Counter Shaft) Close Ratio 2.20 1st Gear TRSGK-M21B $606.96
N.I.
M22 (1st Gear Kit) Updated Incl. Gear, Spacer, Bushing, Bearing TRS18-410-014 $306.96
N.I.
Gear Conversion Kit (M21 to M22) w/ 10 Spline Input MWTGK-M22 $766.96
N.I.
Gear Conversion Kit (M21 to M22) w/ 26 T & 26 Spline Input Shaft TRSGK-M22A $729.92
N.I.
Gear Conversion Kit (M21 to M22) W/ 21 T & 26 Spline Input Shaft TRSGK-M22B $1,227.97

Input, Main & Counter Shafts M21 & M22 Transmission

Illus. #
Description Part Number Your Cost
(Close Ratio + 26T Input Shaft, Wide Ratio = 21T or 24T Input Shaft
13
Input Shaft (21 T) 10 Spline (66-70) (Wide Ratio) TRSAWT297-16B $134.94
13
Input Shaft (21 T) 26 Spline (71-74) (Wide Ratio) TRSAWT297-16C $113.93
13
Input Shaft (24 T) 10 Spline (63-65) (Wide Ratio) TRSAWT297-16A $103.93
13
Input Shaft (26 T) 10 Spline (Except M22) (Close Ratio) MWTAWT297-16 $133.93
13
Input Shaft (26 T) 10 Spline (M22) (66-77) MWTAWT297-16U $259.95
13
Input Shaft (26 T) 26 Spline (Except M22) (71-74) (Close Ratio) MWTAWT297-16D $146.96
13
Input Shaft (26 T) 26 Spline (M22) TRSAWT297-16F $146.96
42
Main Shaft (27 Spline) TRSWT297-2A $187.97
42
Main Shaft (32 Spline) MWTWT297-2B $206.96
42
Main Shaft (32 Spline) TRSWT297-2G $206.96
30
Cluster Shaft (M20) (27-22-19-17) Close Ratio (63-65) MWTWT297-8 $299.00
30
Cluster Shaft (M20) (29-22-19-17) Wide Ration (63-65) MWTWT297-8A $233.93
30
Cluster Shaft (M21) (25-22-19-17) Wide Ratio (66-74) MWYAWT297-8C $186.96
30
Cluster Shaft (M21) (27-22-19-17) Close Ratio (66-74) MWTWT297-8D $240.00
30
Cluster Shaft (M22) (27-22-19-17) Close Ratio (66-74) MWTWT297-8E Call
31
Counter Shaft (7/8" OD) (M20) MWTWT297-3 $24.00
31
Counter Shaft Pin (1" OD) (M21) MWTWT297-3A $40.60
67
Reverse Idler Shaft TRSWT297-35 $15.35

Case & Cover M21 & M22 Transmission

Illus. #
Description Part Number Your Cost
11
Case (7/8" OD Counter Shaft) (M20) TRS18-410-001 $412.92
11
Case (1" OD Counter Shaft) (M21) TRS18-410-002 $412.92
55
Extension Housing (27 Spline Main Shaft) (Pass. Side Speedo) TRS18-410-021 $299.92
55
Extension Housing (32 Spline Main Shaft) TRS18-410-022 $271.91
Covers
Side Cover Kit (3/8" External Threads) 304756K Call
Side Cover Kit (3/8" Internal Threads) TRS18-410-023 $264.94
Side Cover Shift Lug. 1-2 & 3-4 (Bolt Type) TRS18-598-005 $71.91
Cover (Center Support) (Iron) TRS18-672-001 $183.93

Miscellaneous Parts M21 & M22 Transmission

Illus. #
Description Part Number Your Cost
Detent Ball, Reverse TRS453593 $1.91
Detent Spring, Reverse TRST8B-42 $1.91
Drive Speedometer Gear (8 T) 1.18" ID, 1.76" OD TRS3708145 $48.98
Drive Speedometer Gear (8 T) 1.18" ID, 1.84" OD TRS3708144 $38.98
Drive Speedometer Gear (8 T) 1.41" ID, 1.84" OD MWT3978758 $24.00
3
Front Retainer TRSWT297-6 $19.91
Input Nut

GM591150

$10.00
N.I.
Input Nut Wrench TRSWT297-W $48.98
Lug. Reverse (External Threads) TRS18-598-002-1X $68.98
Lug. Reverse (Internal Threads) TRS18-598-006 $79.97
31
Spacer Tube (Fits 1" Counter Shaft) TRS3912195 $5.95
Tapered Roll Pin TRS304485 $17.97