Switch 4 62

broken image


Casting

Year(s)

Ratio

3831704

1963 Only

M20 2.56 1st

M21 2.20 1st

3851325 (1)

1964 - 1965

M20 2.56 1st

M21 2.20 1st

3885010

1966 - 1967 Delivery 32207.

M20 2.52 1st

M21 2.20 1st

M22 2.20 1st

3925660

1968 - 1969

M20 2.52 1st

M21 2.20 1st

M22 2.20 1st

3925661

1970 - 1974

M20 2.52 1st

M21 2.20 1st

M22 2.20 1st

(1) The M22 case casting is unknown at this time

  1. Switch 42
  2. Switch 4 62 Pin
  3. Switch 4 625

Mar 15, 2021 Choosing between the Nintendo Switch and the PlayStation 4 can be tricky. Both systems have commercial and critical success among fans. Unfortunately, the similarities between the two stop there. Layer 2 aggregation switch with (12) 10G SFP+ ports and (4) 10GbE RJ45 ports. The Switch XG 16 (US XG 16) is a fully managed, Layer 2 switch with (12) 10G SFP+ ports and (4) 10GbE RJ45 ports. Its 320 Gbps switching capacity and 160 Gbps total, non-blocking line rate make it an ideal aggregation switch for your core network. This switch can be monitored or configured from anywhere with the. MokerLink 11 Port Gigabit PoE Switch with 8 PoE+ Port, 2 Gigabit Uplink, 1 SFP Port, 120W AI Detection, Qos, Fanless Metal Plug & Play Network Switch 4.5 out of 5 stars 337 $69.99 $ 69. 99 $99.99 $99.99.

Years

Type

Ring(s)

Ratio

Reverse

1963 - 1965

M20

None

2.56 / 1.91 / 1.48 / 1.00

2.64

1966 - 1975

M20

Two

2.52 / 1.88 / 1.46 / 1.00

2.59

1964 - 1975

M21

One

2.20 / 1.64 / 1.28 / 1.00

2.26

1967 - 1972(2)

M22

None

2.20 / 1.64 / 1.28 / 1.00

2.26

Saginaw M20

M20

One

2.54 / 1.80 / 1.44 / 1.00

Switch

Ratio of drop between gears

Transmission

1st

2nd

% Reduction

3rd

% Reduction

4th

% Reduction

Reverse

M20 (63-65)

2.56

1.91

25.39%

1.48

22.51%

1.00

32.43%

2.64

M20 (66>)

2.52

1.88

25.40%

1.46

22.34%

1.00

31.51%

2.59

M21/M22

2.20

1.64

25.45%

1.28

21.95%

1.00

21.88%

2.26

Years

Type

Ring(s)/Groove(s)

Input Splines

Output Splines

1963 - 1965

M20

None

10

27

1966 - 1970

M20

Two

10

27

1971 - 1974

M20

Two

26

32

1963 - 1965

M21

One

10

27

1966 - 1970

M21

One

10

27

1971 - 1974

M21

One

26

32

1965 - 1970(1)

M22

None

10

27

1970 - 1972(2)

M22

None

26

32

(1) All M22 applications except454 engine.
(2) All 454 Chevelle applications.The M22 was produced in 1973 and 1974 for other GM divisions.

All wide ratio transmissions are designated M20 and close ratiotransmissions are designated M21 or M22 depending on the gear set. From1963 to 1965 the close ratio M21 was ordered under the M20 RPO code and thefactory decided whether to install a wide ratio M20 or close ratio M21depending on the rear axle ratio specified. From 1966 on, the customer coulddecide the transmission selection.

The M20 and M21 have the same cut to the gears, theM22 is a straighter cut resulting in a greater strength. Since the M20 and M21look the same one way to tell them apart (aside from the grooves on the inputshaft) is the tooth count on the cluster gear.

Switch 42

Switch

Ratio of drop between gears

Transmission

1st

2nd

% Reduction

3rd

% Reduction

4th

% Reduction

Reverse

M20 (63-65)

2.56

1.91

25.39%

1.48

22.51%

1.00

32.43%

2.64

M20 (66>)

2.52

1.88

25.40%

1.46

22.34%

1.00

31.51%

2.59

M21/M22

2.20

1.64

25.45%

1.28

21.95%

1.00

21.88%

2.26

Years

Type

Ring(s)/Groove(s)

Input Splines

Output Splines

1963 - 1965

M20

None

10

27

1966 - 1970

M20

Two

10

27

1971 - 1974

M20

Two

26

32

1963 - 1965

M21

One

10

27

1966 - 1970

M21

One

10

27

1971 - 1974

M21

One

26

32

1965 - 1970(1)

M22

None

10

27

1970 - 1972(2)

M22

None

26

32

(1) All M22 applications except454 engine.
(2) All 454 Chevelle applications.The M22 was produced in 1973 and 1974 for other GM divisions.

All wide ratio transmissions are designated M20 and close ratiotransmissions are designated M21 or M22 depending on the gear set. From1963 to 1965 the close ratio M21 was ordered under the M20 RPO code and thefactory decided whether to install a wide ratio M20 or close ratio M21depending on the rear axle ratio specified. From 1966 on, the customer coulddecide the transmission selection.

The M20 and M21 have the same cut to the gears, theM22 is a straighter cut resulting in a greater strength. Since the M20 and M21look the same one way to tell them apart (aside from the grooves on the inputshaft) is the tooth count on the cluster gear.

Switch 42

1963-1965:
M21 tooth count - 27, 22, 19, 17
M20 tooth count - 29, 22, 19, 17

1966-1974:
M21 tooth count - 27, 22, 19, 17
M20 tooth count - 25, 22, 19, 17

There are 7 different input shaft possibilities on a Muncie. All 26 splineinputs came with 32 spline output shafts and all 10 spline inputs came with 27spline output shafts. It is commonly mistaken that all 'fine spline'26 spline input shafts are M22 transmissions. The M22 transmission has a 20degree helix angle on the gear set as opposed to a 45 degree angle found on theM20 and M21 and were made with a higher nickel alloy. The straighter angle wasdesigned to produce less end loading of the gear train and less heat butcreated more noise, thus the nickname 'Rock Crusher' was born.Another misconception is if you have a drain plug you have a M22. This was onlytrue when the first M22 boxes were created; all 3925661 castings (1970-1974)had drain plugs.

Partial or 'concealed/confidential' VIN Stamping

Most transmissions since 1962 will also have a CON VIN (concealed orconfidential VIN, whichever term one likes) stamped in the case generally alongthe top ridge or even on a mounting surface such as the flange mounting thetail shaft to the main case noting the original car it was installed in. Thestamped CON VIN is the same that is stamped on the engine pad in all 1968 andlater Chevelles, and generally 1966 & 1967 SS396 Chevelles with an alphanumeric set of characters like7K123456; model year, assembly plant, and vehicle sequence number. The engineand transmission were stamped at the same time by the final assembly plant

Most plants stamped the CON VIN on the top whilesome stamped it on the side near the date code. Characteristics of the VINstamp, including the location, type size of the stamp, and the method(individual or 'gang' stamped) was chosen by the individual assembly plant.

1963 through 1966

Date codes from 1963 to 1966 included only the month & day; such asP0110 indicates January (01) 10th day (10).

1967 and 1968

Switch 4 62 Pin

In 1967 and 1968, the date code got a year designator and a letterdesignator for the month such as P8A01, meaning 1968 (8), January (A) 1st (01).Note that a Muncie dated with a September to December build date was actuallybuilt the prior calendar year. An example would be the date code P8T13, meaning1968 (8), December (T), 13th. The transmission was assembled December 13, 1967for the 1968 model year. Likewise a P8S28 stamp means 1968 (8), September (S),28th of the calendar year 1967 for a 1968 Chevelle.See second example below.

1969 through 1974

Switch 4 625

The 1969 to 1974 Muncie got a ratio designating letter at the end of thedate code. An example would be P2C25B. This decodes to 1972 (2), March (C),25th, M21 (B).

Note: The ratio designation letter didn't appear until around October 1,1968 for the 1969 model year so any Muncie in a 1969 Chevelledated August (M) or September (P) would probably not have the A, B, or Cdesignation.

Date codes:

A ~ January

B ~ February

C ~ March

D ~ April

E ~ May

H ~ June

K ~ July

M ~ August

P ~ September

R ~ October

S ~ November

T ~ December

Type Codes: A ~ M20, B ~ M21, C~ M22

Main Case

3831704

1963 Only small 6207NR Front Bearing ,Pat. Pending, 7/8' Bore

3839606

1964 Regular Bearing Pat. Pending, 7/8' Bore

3864_____

1964 Milled off last 3 digits 7/8' Bore Patent Pending

3851325

1964 - 1965 7/8' Bore Patent Pending Mostly 1964

3851325

1964 - 1965 7/8' Bore Patent Number

3885010

1966 - 1967 1' Bore Patent Number

3925660 (3)

1968 - 1969 1' Bore Patent Number

3925661

1970 - 1974 (some early 1975 cars) 1' Bore Patent Number

(3) Colvin's 'by the numbers' book notes that Muncie data shows 1968 and 1969 M22 transmissions received main case #3925661. All documented M22 transmissions have the #3925660 main case. It is unclear why there is the discrepancy.

Tail Housing

3831731

1963 'Thin Fin Tail' Driver speedometer 27 spline

3846429

1964 - 1970 'Thin Fin Tail' Driver speedometer 27 spline

9779246

1964 - 1968 Pontiac & Oldsmobile Long Tail Driver Speedo 27 Spline

3857584

1966 - 1970 Passenger side speedometer, 27 spline (all except Chevelle)

3978764

1970 - 1974 passenger speedometer, 32 spline output (Chevelle only)

Side Cover

3831707

1963-1965 Early side cover stud type shift shafts

3884685

1966-1968 Used with 3857584 tail stud type shift shafts

3950306

1969 Short boss with bolt on type shift shafts - no switches

3952642

Long boss bolt on type w/ TCS switch on 3-4 (not verified)

3952648

1970-74 Short boss bolt on type w/ TCS switch on 3-4

335308

Long boss bolt on type with neutral safety switch. Some have a boss for the switch that is cast but not machined on 1-2.





broken image