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Transmissions - 1972
As you can see in the matrices below, the 2-speed Powerglide, the 3-speed Turbo Hydra-Matic M38 and M40 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 and close ratio heavy duty M22.
Manual Transmission Ratios
| ENGINE | TRANSMISSION | TOTAL GEAR REDUCTION * | AXLE RATIO | ||||
| 1st | 2nd | 3rd | 4th | Rev | |||
| 110 hp Turbo-Thrift 250 L6 |
3-speed | 8.78 | 5.17 | 3.08 | 9.09 | 3.08:1 | |
| 130 hp Turbo-Fire 307 V8 |
3-speed | 8.78 | 5.17 | 3.08 | 9.09 | 3.08:1 | |
| 165 hp Turbo-Fire RPO L65 |
3-speed 4-speed |
7.82 8.53 |
4.62 6.05 |
3.08 4.84 |
3.36 |
8.10 8.53 |
3.08:1 3.36:1 |
| 175 hp Turbo-Fire RPO L48 |
3-speed 4-speed |
8.41 8.41 |
4.97 5.96 |
3.31 4.77 |
3.31 |
8.71 8.41 |
3.31:1 3.31:1 |
| 240 hp Turbo-Jet RPO LS3 |
H.D. 3-speed 4-speed |
8.01 8.34 |
5.23 6.22 |
3.31 4.83 |
3.31 |
7.98 8.57 |
3.31:1 3.31:1 |
| 270 hp Turbo-Jet RPO LS5 |
4-speed (M22 only) | 8.28 | 5.43 | 4.20 | 3.31 | 7.48 | 3.31 |
Automatic Transmission Ratios
| ENGINE | TRANSMISSION | SELECTOR POSITION |
TOTAL TORQUE MULTIPLICATION * |
AXLE RATIO |
| 110 hp Turbo-Thrift L6 |
Powerglide | Drive Low & Reverse |
11.77:1 - 3.08:1 11.77:1 - 5.61:1 |
3.08:1 |
| 130 hp Turbo-Fire 307 V8 |
Powerglide | Drive Low & Reverse |
11.77:1 - 3.08:1 11.77:1 - 5.61:1 |
3.08:1 |
| Turbo Hydra-Matic (M38 TH350) | Drive Low Second Reverse |
14.44:1 - 2.73:1 14.44:1 - 6.88:1 14.44:1 - 4.15:1 11.06:1 - 5.27:1 |
2.73:1 | |
| 165 hp Turbo-Fire RPO L65 |
Turbo Hydra-Matic (M38 TH350) | Drive Low Second Reverse |
14.44:1 - 2.73:1 14.44:1 - 6.88:1 14.44:1 - 4.15:1 11.06:1 - 5.27:1 |
2.73:1 |
| 175 hp Turbo-Fire RPO L48 |
Turbo Hydra-Matic (M38 TH350) | Drive Low Second Reverse |
14.44:1 - 2.73:1 14.44:1 - 6.88:1 14.44:1 - 4.15:1 11.06:1 - 5.27:1 |
2.73:1 |
| 240 hp Turbo-Jet RPO LS3 |
Turbo Hydra-Matic (M40 TH400) | Drive Low Second Reverse |
14.22:1 - 2.73:1 14.22:1 - 6.77:1 14.22:1 - 4.15:1 11.93:1 - 5.68:1 |
2.73:1 |
| 270 hp Turbo-Jet RPO LS5 |
Turbo Hydra-Matic (M40 TH400) | Drive Low Second Reverse |
17.25:1 - 3.31:1 17.25:1 - 8.21:1 17.25:1 - 4.90:1 14.46:1 - 6.88:1 |
3.31:1 |
| * Axle ratio times transmission ratio | ||||
Clutch/Flywheel
110 hp L6 - Outside & inside diameter: 9.12 x 6.12
130 hp, 165 hp, and 175 hp V8 - Outside & inside diameter: 10.34
x 6.50
240 hp and 270 hp V8 - Outside & inside diameter: 11.00 x 6.50
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