Muncie

 

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Muncie M22 sounds I recorded with 4.10 gears. www.nastyz28.com/~copo/m22sounds.zip    

 

 

              

 

 

Side view id.

Muncie (left)             Saginaw (center)             Borg Warner (right)

 

 

Shifter Info

 

shifter knob wo console.jpg (28396 bytes) shifter knob 2 piece.jpg (41386 bytes)

2 piece for 1970 without a console

 

shifter.jpg (46749 bytes)         shift ball nut.jpg (19235 bytes)       hurst white knob.jpg (19937 bytes)       shifter to floor seal.jpg (46444 bytes)

Chrome w/console        Shifter ball nut     Aftermarket Ball           Floor seal for shifter

 

 hurst comp plus shifter with stock stick.jpg (29219 bytes)    

 Hurst Comp/Plus shifter with stock stick shift        

 

hurst comp plus stick and super stick.jpg (33927 bytes) 

Hurst Comp/Plus shifter stick and Hurst Super shifter stick 

 

71 shift knob front.jpg (10187 bytes)    71 shift knob side.jpg (11734 bytes)

1971 shifter knob w/o console 

 

                            

m20_gears.jpg (20218 bytes)        m21_mainshaft_gears.jpg (13521 bytes)    m22_gears.jpg (11711 bytes)

         M20                                          M21               M22 (missing 3rd gear)   

     

m22_mainshaft_gears.jpg (29197 bytes)        m22_open_side_cover.jpg (46543 bytes)

          M22                                  M22 side cover

 

input shaft bushing.jpg (21229 bytes)

Bronze Input Shaft bushing

 

 

speedo reducer1.jpg (26453 bytes)  speedo reducer2.jpg (33610 bytes) speedo reducer3.jpg (52328 bytes)

Part # 3950352 (it has Stewart Warner and ratio .8241 stamped on it). Used on 1970-75 all ST (standard transmissions).

                Speedo cable adapter 

 

 

 

doc_muncie_lever_ctrl_rods.jpg (40381 bytes)        doc_muncie_exploded_view.jpg (36983 bytes)         

Levers & Control Rods        Exploded view

 

doc_muncie_parts_desc.jpg (77872 bytes)        doc_muncie_adjust_shifter.jpg (53652 bytes)        doc_clutch_pedal_linkages.jpg (38959 bytes)

Parts description              Shifter adjustments            Clutch pedal linkage

 

doc_clutch_lower_linkage.jpg (23623 bytes)

 Clutch lower linkage

 

Click here on how to ID a Muncie

 

The Muncie 4-speed transmission was used with many different GM models and engine combinations from 1963 through 1974. The main difference between the Muncie and the Borg-Warner is that the Muncie has a 7-bolt side cover and the Borg Warner has a 9-bolt side cover. 

 

Muncie 4-speeds were produced in two different ratios wide ratio (M-20) and close-ratio (M-21). An extra heavy duty close-ratio version (M-22) was also offered on many of the big-block high-performance models. The choice of transmission was dictated by the engine size and rear-axle ratio. Axle ratios of 3.73 and lower (numerically higher) came with close-ratio transmissions, while axle ratios of 3.55 and higher (numerically lower) used wide-ratio transmissions. In addition, many GM high-performance engines came with M-22 “Rock-Crusher” in the 1970-73 years, however an early version of the M-22 was available as early as 1965 in Corvettes. 
 
The main internal differences in the 3 types of transmissions are listed in the parts below.
• M-20 differs from M-21: Input shaft and Cluster gear
• M-20 & M-21 differ from M-22: Input shaft, Cluster gear, First, Second, Third, Reverse idler gear. All other components interchange, with the exception of production upgrades and changes. For example, 1963-65 synchronizers, blocking rings, etc. do not interchange with 1966 and newer versions, and therefore the transmission must be stock or interchanged as a unit.
 

 

                            1970 Information

 

Casting: 3925660  Years: 1968 - 1970  Ratios: M20 2.52 1st , M21 2.20 1st, M22 2.20 1st

Casting: 3925661  Years: 1970 - 1974  Ratios: M20 2.52 1st , M21 2.20 1st, M22 2.20 1st

 

Ratios:

 

Year 1966-1974    Type: M20   Rings: Two    Ratio: 2.52 / 1.88 / 1.46 / 1.00 / 3.11

Year 1963-1974    Type: M21   Rings: One    Ratio: 2.20 / 1.64 / 1.28 / 1.00 / 2.27

Year 1967-1974    Type: M22   Rings: None   Ratio: 2.20 / 1.64 / 1.28 / 1.00 / 2.27

 

Reading Serial & VIN Numbers

 

Example 70N553721 P0E08C

70 = 1970

N = Norwood

553721 = the last 6 digits of your VIN

P = Muncie

0 = 1970

E = May

08 = day

C = M22 (A=M20, B=M21)

 

 

Swapping GM's Borg Warner T5-speed found in '83 Z28s & Trans Ams

 

Note max HP in article.

 

doc_convert_4spd_to_5spd.jpg (46491 bytes)