The Saginaw 4-speed transmission from General Motors is one of the most popular and widely used transmissions in the racing and rodding industry. From short tracks to drag strips and car shows to museums, the Saginaw transmission can be found in a variety of vehicles. 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. 2-, 4-, 5- & 6-Speed Manual Transmissions Whether you’re looking for a manual transmission as an OEM replacement part or looking to add a performance shifter to your speed machine, Summit Racing has all of the 2-, 4-, 5- and 6-speed manual trannys you need to keep charging to the front of the pack.
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.
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!
| Application | Model Years |
|---|
| Chevrolet 4 Speed 27 Spline | 1964-1967 |
| Chevrolet & GMC Rock-crusher | 1966-1974 |
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
| 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 | $1000.00 |
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 | 1$75.75 |
| N.I. | M20 (63-65) (80mm OD Input Bearing)*HD Kits Available | MWTBK117 | $77.31 |
| N.I. | M21 M22 (66-74) (7/8″ Dia. Counter Shaft Pin) *HD Kits Available | MWTBK117 | $77.31 |
| N.I. | M21 M22 (66-74) (1″ Dia. Counter Shaft Pin)*HD Kits Available | MWTBK116 | $75.00 |
| *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 | $120.05 |
| 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 |
|---|
| Kits w/OE Style Bearings |
| N.I. | Gasket Kit | MWTGS297-55 | $5.50 |
| Gaskets |
| N.I. | Gasket, Bearing Retainer | TRS304301 | $2.93 |
| Seals |
| 79 | Shifter Seal | MWT100281 | $1.33 |
| 58 | Rear Seal (27 Spline Main Shaft) | TRS44074 | $5.90 |
| 58 | Rear Seal (32 Spline Main Shaft) | TRS34074 | $25.00 |
| 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 | $25.42 |
| N.I. | Small Parts Kit (1″ OD Counter Shaft) (M21 M22) | MWTSP297-50 | $25.42 |
| N.I. | Transmission Conversion Kit (Complete) (M21 to M22) | TRS331066 | $3.93 |
| 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 | $21.00 |
| 10 | Input Bearing (Heavy Duty) | TRSN1307L | $14.00 |
| N.I. | Input Bearing Slinger | TRSSP835 | $3.93 |
| 47 | Rear Main Shaft Bearing (40mm ID, 23mm Thick, 90mm OD) | TRS6308-N | $12.00 |
| 47 | Rear Main Shaft Bearing (40mm ID, 23mm Thick, 90mm OD) Max load | TRSM6308N | $12.00 |
| Pocket Needle Bearing (w/Cage | MWTJV441419 | $10.50 |
| Input Needle Bearing no cage | MWTJV441419-N | $10.50 |
Sliders M21 & M22 Transmission
4 Speed Transmission Mopar
| Illus. # | Description | Part Number | Your Cost |
|---|
| 36A | Slider, 1-2 & 3-4 (Torque Lock Type) | TRST10-15 | $28.98 |
Syncro Assemblies & Rings M21 & M22 Transmission
| Illus. # | Description | Part Number | Your Cost |
|---|
| 57 | Extension Housing (1.630″ OD) | TRSWT266-62 | $7.50 |
| 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 | $85.80 |
| 36, 37 | 1-2 Synchro Key & Spring Kit | MWTWT297-K | $7.33 |
| 35 | 1-2 Synchro Ring (Early, Non-Stepped Shoulder) | MWTWT297-14 | $8.50 |
| 35 | 1-2 Synchro Ring (Late, Stepped Shoulder) | TRSWT297-14A | $7.90 |
| 38 | 3-4 Synchro Assembly (Complete) | MWTAWT297-2.5A | $99.99 |
| 36, 37 | 3-4 Synchro Key & Ring Spring Kit | TRS304701-2K | $4.94 |
| 35 | 3-4 Synchro Ring (Early, Non-Stepped Shoulder) | TRSWT297-14 | $8.50 |
| 35 | 3-4 Synchro Ring (Late, Stepped Shoulder) | TRSWT297-14A | $7.90 |
| 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 | $33.00 |
| 17 | Reverse Fork | TRSWT297-23A | $29.97 |
Gears M21 & M22 Transmission
Chevy 350 Manual Transmission
| Illus. # | Description | Part Number | Your Cost |
|---|
| 43 | 1st Gear (36 T) M21 (63) | MWTWT297-12 | $86.19 |
| 43 | 1st Gear (36 T) (Except M22) (64-74) | MWTWT297-12A | $65.00 |
| 43 | 1st Gear (36 T) (M22) (64-74) | MWTWT297-12B | $125.00 |
| 43 | 1st Gear (M20), (M21), (M22) | MWTWT297-36 | $89.00 |
| 52 | 2nd Gear (30 T) (Except M22) (63-74) | TRSWT297-21 | $75.00 |
| 52 | 2nd Gear (30 T) (M22) (63-74) | MWTWT297-21A | $105.00 |
| 39 | 3rd Gear (27 T) (Except M22) (63-74) | MWTWT297-11 | $55.00 |
| 39 | 3rd Gear (27 T) (M22) (63-74) | MWTWT297-11A | $105.50 |
| 52 | Reverse Gear (35 T) (63-74) | MWTWT297-36 | $89.00 |
| 52 | Reverse Gear (40 T) (63-74) | TRS290-36A | $79.00 |
| 73 | Front Idler Gear (Except M22) | 304819B | Call |
| 73 | Front Idler Gear (M22) | TRSWT297-10B | $45.00 |
| 73 | Reverse Idler Gear (27 T) 27 Spline | MWTAWT297-10A | $45.00 |
| 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 | $449.92 |
| 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 | $575.00 |
| 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 |
4 Speed Transmission Chevy
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 | $112.56 |
| 13 | Input Shaft (21 T) 26 Spline (71-74) (Wide Ratio) | TRSAWT297-16C | $110.00 |
| 13 | Input Shaft (24 T) 10 Spline (63-65) (Wide Ratio) | TRSAWT297-16A | $117.08 |
| 13 | Input Shaft (26 T) 10 Spline (Except M22) (Close Ratio) | MWTAWT297-16 | $85.00 |
| 13 | Input Shaft (26 T) 10 Spline (M22) (66-77) | MWTAWT297-16U | $194.60 |
| 13 | Input Shaft (26 T) 26 Spline (Except M22) (71-74) (Close Ratio) | MWTAWT297-16D | $110.00 |
| 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 | $155.00 |
| 42 | Main Shaft (32 Spline) | TRSWT297-2G | $206.96 |
| 30 | Cluster Shaft (M20) (27-22-19-17) Close Ratio (63-65) | MWTWT297-8 | $225.00 |
| 30 | Cluster Shaft (M20) (29-22-19-17) Wide Ration (63-65) | MWTWT297-8A | $138.46 |
| 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 | $180.00 |
| 30 | Cluster Shaft (M22) (27-22-19-17) Close Ratio (66-74) | MWTWT297-8E | Call |
| 31 | Counter Shaft (7/8″ OD) (M20) | MWTWT297-3 | $18.00 |
| 31 | Counter Shaft Pin (1″ OD) (M21) | MWTWT297-3A | $30.45 |
| 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 | $350.35 |
| 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
4 Speed Transmission Ford
| 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 | $18.00 |
| Drive Speedometer Gear (8 T) 1.18″ ID, 1.84″ OD | TRS3708144 | $18.00 |
| Drive Speedometer Gear (8 T) 1.41″ ID, 1.84″ OD | MWT3978758 | $18.00 |
| 3 | Front Retainer | TRSWT297-6 | $21.00 |
| Input Nut | GM591150 | $10.00 |
| N.I. | Input Nut Wrench | TRSWT297-W | $19.85 |
| 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 |