Chevy Manual Transmission

Chevy Manual Transmission Identification

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

To quickly finger what you have, notice in the above picture:
The muncie reverse lever is in the extention housing, and the cover has 7 bolts.
The Saginaw reverse shift lever is on the cover, and the cover has 7 bolts.
The Borg Warner has a 9 bolt cover.
Muncies are the hot tip, since they usually were used with high performance engines. Again on the muncie, and looking at the cover, 3rd/4th gear lever is on the left. 1st/2nd gear lever is on the right.

Further Muncie identification
3 Muncie 4 speeds were offered. The M-20 wide ratio, the M-21 close ratio, and the 'Extra heavy duty close ratio' M-22, also known as the 'Rock Crusher'. The M-22 was generally installed behind severely powerful (high torque) big-block engines. The M-22 is distinguished from an M-21 by the angle of the gear teeth. The M-22 has 'straight cut' gears. Due to this, the box tends to be noiser (whines or howls almost like a blower, which is why it's called a 'rock crusher') than other boxes. The M-21 has a higher pitch angle on its gear teeth.

The close ratio gearboxs generally came with Oct usb devices driver. 3.73+ gear ratio'ed cars. 3.55 geared and higher (numerically lower) cars used the wide ratio gearbox.

Due to the wide combination of id's, stampings, numbers, etc.. varied and even GM couldn't keep track of what was what, it's best to ID your gearbox visually, taking what is stamped on the box FWIW. The best way to ID the transmission is to count teeth.

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Muncie 4 speed spline, groove and tooth count characteristics.

Transmissions come in two basic types, Automatic and Manual: Automatic TH350. Best transmission choice, hands down. The Turbo Hydra-matic 350 was first used in 1969 model cars. It was developed jointly by Buick and Chevrolet to replace the two-speed Super Turbine 300 and aluminum case Powerglide transmissions.

Type/Year	Input Spline	Input Groove	Input Gear Tooth Count Drivers presonus others.	Cluster Gear Tooth Count	Output Spline	Gear Ratio
M20: 1963 - 65	10	none	24	29-22-19-17	27	Note 1
M20: 1966 - 70	10	2	21	25-22-19-17	27	Note 2
M20: 1971 - 74	26	2	21	25-22-19-17	32	Note 2
M21: 1963 - 70	10	1	26	27-22-19-17	27	Note 3
M21: 1971 - 74	26	1	26	27-22-19-17	32	Note 3
M22: 1965 - 70	10	none	26	27-22-19-17	27	Note 3
M22: 1971 - 72	26	none	26	27-22-19-17	32	Note 3

Note 1: M-20 gear ratio: 1st 2.56:1, 2nd 1.91:1, 3rd 1.48:1, 4th direct
Note 2: M-20 gear ratio: 1st 2.52:1, 2nd 1.88:1, 3rd 1.46:1, 4th direct, Rev 2.59:1.
Note 3: M-21/22 gear ratio: 1st 2.20:1, 2nd 1.64:1, 3rd 1.28:1, 4th direct, Rev 2.27:1

Effective October 21, 1968, an additional letter was added to the plant prefix number to help identify the gear ratios in Muncie transmissions. The additional letter codes as follows:

Muncie 3 speed Manual

Muncie 4 speed manual transmissions

Suffix	1st gear ratio
A	3.03:1
B	2.42:1

Suffix	1st gear ratio
A	2.52:1 wide range
B	2.20:1 close range
C	2.20:1 Rock Crusher

Norav medical driver download. Of course like engines, transmissions come and go over time, so below is the (as complete as I can make it) transmission plant prefix list:

Plant	Type	Prefix	Plant	Type	Prefix
Cleveland	Manual Powerglide	A	Saginaw	overdrive	O
Cleveland	Turbo Hydramatic	B	Warner Gear	3 & 4 speed	P
Cleveland	Powerglide	C	Muncie	4 speed	P
Hydramatic	Turbo Hydramatic	CA	Muncie	4 speed	R
Saginaw	Overdrive	D	Saginaw	4 speed	R
McKinnon	Powerglide	E	Muncie	3 speed	S
Muncie	3 speed	H	Saginaw	3 speed	S
McKinnon	3 speed	K	Toledo	Powerglide	T
GM of Canada	Turbo Hydramatic	L	Cleveland	Turbo Hydramatic	X
Muncie	3 speed and Overdrive	M	Toledo	Turbo Hydramatic	Y
Muncie	4 speed	N

Chevy manual transmission identification

Chevy Manual Transmission 4x4

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Chevy 350 4 Speed Manual

Last updated: 10/20/2011
Author: MadMike Maciolek

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