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Transmissions - 1969
As you can see in the matrices below, several versions of the 2-speed Powerglide, the 3-speed Turbo Hydra-Matic automatic transmission, and several versions of the manual 3-speed transmissions were used based on the particular engine and its horsepower rating. The matrix represents the gear ratio multiplication factor based on the gear set in the transmission and the rear end axle ratio. The manual 4-speed transmission was available in four versions, a wide ratio cast iron case Saginaw M20, an aluminum case Muncie M20, a close ratio M21 and heavy duty M22.
Manual Transmission Ratios
| ENGINE | TRANSMISSION | TOTAL GEAR REDUCTION * | AXLE RATIO |
||||
| 1st | 2nd | 3rd | 4th | Rev | |||
| 140 hp Turbo-Thrift L6 |
3-speed | 8.78 | 5.17 | 3.08 | 9.08 | 3.08:1 | |
| H.D. 3-speed | 9.33 | 5.39 | 3.08 | 9.30 | 3.08:1 | ||
| 155 hp Turbo-Thrift L6 RPO L22 |
3-speed | 8.78 | 5.17 | 3.08 | 9.09 | 3.08:1 | |
| H.D. 3-speed | 9.33 | 5.39 | 3.08 | 9.30 | 3.08:1 | ||
| 200 hp Turbo-Fire V8 |
3-speed | 8.78 | 5.17 | 3.08 | 9.08 | 3.08:1 | |
| H.D. 3-speed | 9.33 | 5.39 | 3.08 | 9.08 | 3.08:1 | ||
| 4-speed (2.85:1) | 9.58 | 6.79 | 4.54 | 3.36 | 9.58 | 3.36:1 | |
| 250 hp Turbo-Fire V8 RPO L65 |
H.D. 3-speed | 8.01 | 5.23 | 3.31 | 8.57 | 3.31:1 | |
| 4-speed (2.54:1) | 8.40 | 5.95 | 4.77 | 3.31 | 8.40 | 3.31:1 | |
| 300 hp Turbo-Fire V8 RPO L48 |
H.D. 3-speed | 8.01 | 5.23 | 3.31 | 7.98 | 3.31:1 | |
| 4-speed (2.52:1) | 8.34 | 6.22 | 4.83 | 3.31 | 8.57 | 3.31:1 | |
| 325 hp Turbo-Jet V8 |
H.D. 3-speed | 8.01 | 5.23 | 3.31 | 7.98 | 3.31:1 # | |
| 4-speed(2.52:1) | 8.34 | 6.22 | 4.83 | 3.31 | 8.57 | 3.31:1 # | |
| 350 & 375 hp Turbo-Jet V8 RPO L34 & L78 |
H.D. 3-speed | 8.59 | 5.61 | 3.55 | 8.55 | 3.55:1 # | |
| 4-speed (2.52:1) | 8.95 | 6.67 | 5.18 | 3.55 | 9.19 | 3.55:1 # | |
| 4-speed (2.20:1) | 7.81 | 5.82 | 4.51 | 3.55 | 8.02 | 3.55:1 # | |
Note: The 255hp 350cid RPO LM1 engine is not shown in GM's specifications but it would seem logical to assume the manual transmission data would be the same as the 300hp RPO L48 engine. The LM1 engine's main difference from the L48 were the cylinder heads.
Automatic Transmission Multiplication Factors
| ENGINE | SELECTOR POSITION | TOTAL TORQUE MULTIPLICATION * |
AXLE RATIO | |
| POWERGLIDE - TURBO HYDRA-MATIC | ||||
| 140 hp Turbo-Thrift L6 and 155 hp Turbo-Thrift L6 |
Powerglide Drive Low & Reverse Turbo-Hydra-Matic 350 Drive Low Second Reverse |
11.77:1 - 3.08:1 11.77:1 - 5.61:1 14.44:1 - 2.73:1 14.44:1 - 6.88:1 14.44:1 - 4.15:1 11.00:1 - 5.26:1 |
3.08:1 2.73:1 |
|
| 200 hp Turbo-Fire V8 | Powerglide Drive Low & Reverse Turbo-Hydra-Matic 350 Drive Low Second Reverse |
11.77:1 - 3.08:1 11.77:1 - 5.61:1 14.44:1 - 2.73:1 14.44:1 - 6.88:1 14.44:1 - 4.15:1 11.00:1 - 5.26:1 |
3.08:1 2.73:1 |
|
| 255 hp Turbo-Fire V8 and 300 hp Turbo-Fire V8 |
Powerglide Drive Low & Reverse Turbo-Hydra-Matic 350 Drive Low Second Reverse |
|
2.73:1 2.56:1 |
|
| 325 hp Turbo-Jet V8 | Turbo-Hydra-Matic 400 Drive Low Second Reverse |
17.24:1 - 3.31:1 17.24:1 - 8.21:1 17.24:1 - 4.90:1 14.46:1 - 6.88:1 |
3.31:1 # | |
| 350 hp Turbo-Jet V8 | Turbo-Hydra-Matic 400 Drive Low Second Reverse |
18.50:1 - 3.55:1 18.55:1 - 8.80:1 18.50:1 - 5.25:1 15.51:1 - 7.38:1 |
3.55:1 # | |
* Axle ratio times transmission ratio.
# 12-bolt rear end.
3-Speed Manual Transmission - Cast Iron
| ENGINES | 1st Gear | 2nd Gear | 3rd Gear | Reverse |
| 140-hp L6 155-hp L6 200-hp V8 |
2.85:1 | 1.68:1 | 1.00:1 | 2.95:1 |
3-Speed Manual Transmission - Cast Iron & Heavy Duty MC1
| ENGINE | 1st Gear | 2nd Gear | 3rd Gear | Reverse |
| 140-hp L6 155-hp L6 200-hp V8 |
3.03 | 1.75 | 1.00 | 3.02 |
| Other V8s | 2.42 | 1.59 | 1.35 | 2.41 |
All V8 heavy duty manual 3-speed transmissions are floor shifted.
4-Speed Manual Transmission - M20
| ENGINE | 1st Gear | 2nd Gear | 3rd Gear | 4th Gear | Reverse |
| 200-hp V8 | 2.85 | 2.02 | 1.24 | 1.00 | 2.85 |
| 250-hp V8 | 2.54 | 1.80 | 1.44 | 1.00 | 2.54 |
| All other V8s | 2.52 | 1.88 | 1.46 | 1.00 | 2.59 |
No data available on L78 but one can assume the L78 would not be ordered with an M20.
4-Speed Manual Transmission - M21/M22
| ENGINE | 1st Gear | 2nd Gear | 3rd Gear | 4th Gear | Reverse |
| 350-hp V8 375-hp V8 |
2.20 | 1.64 | 1.27 | 1.00 | 2.26 |
Clutch/Flywheel
| ENGINE | 140-hp L6 | 155-hp L6 | 200-hp V8 | 255-hp V8 | 300-hp V8 | 325-hp & 350-hp V8 | ||
| TRANS | 3-spd | 3-spd | 3-spd | 4-spd | 3- & 4-spd | 3- & 4-spd | 3- & 4-spd | |
| Type | Std & H.D. | Diaphragm spring | Semi-centrifugal bent finger design diaphragm | |||||
| Facing Material | Std & H.D. | Woven asbestos | Premium grade woven asbestos | |||||
| O.D. | Standard | 9.12-in | 10.34-in | 11.00-in | ||||
| Heavy Duty | * | 10.00-in | ||||||
| Facing Area | Standard | 71.82-in | 101.54-in | 123.70-in | ||||
| Heavy Duty | * | 201.06-in | ||||||
* RPO MA6 - Heavy Duty Clutch (dual disc)
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