D & L Transmission 
To order call 1-631-351-4837
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Muncie Transmission ID and Ratio Guide
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Series
Gear Ratio
1st, 2nd, 3rd, 4th
Spline
Input
Grooves
Input
Cluster 
Pin 
Tooth
Count
Input
Tooth 
Count 4th
Cluster
Output
Spline
M-20 wide ratio 63-65

M-20 wide ratio 66-70

M-20 wide ratio 71-74

M-21 close ratio 63-65

M-21 close ratio 66-70

M-21 close ratio 71-74

M-22 close ratio 65-69

M-22 close ratio 70-74

2.56, 1.91, 1.48, 1.00

2.52, 1.88, 1.46, 1.00

2.52, 1.88, 1.46, 1.00

2.20, 1.64, 1.28, 1.00

2.20, 1.64, 1.28, 1.00

2.20, 1.64, 1.28, 1.00

2.20, 1.64, 1.28, 1.00

2.20, 1.64, 1.28, 1.00

10

10

26

10

10

26

10

26

none

2

2

1

1

1

none

none

7/8 

1"

1"

7/8

1"

1"

1"

1"

24

21

21

26

26

26

26

26

29

25

25

27

27

27

27

27

27

27

32

27

27

32

27

32

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All 67-74 Muncies carry a producion code number stamped vertically on right side of case beginning with "P".
(example: P7A14- Muncie 1967, Jan 14)
Muncies assembly codes are model year. (example: P8R23 is assembled Oct 23, 1967 for 1968 model year. Some Muncies also carry ratio I.D. (A, B, C,) Last digit of assembly code.
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A = Jan
E = May
P = Sept
B = Feb
H = June
R = Oct
C = March
K = July
S = Nov
D = April
M = August
T = Dec
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Gear Ratio Guide
A-2.52 - wide
B- 2.20 - close
C- 2.20 - H.D. M-22
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Muncie
Parts List
Four Speed Transmission-
Exploded View
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