HK/HT/HG Gearbox Ratios
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Page created by Qute Mar 13th 2005:
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[edit] HK/HT/HG Gearbox Ratios:
Gearbox | Type | Reverse | First | Second | Third | Fourth |
| Powerglide (6 Cyl) | Automatic | 1.82:1 | 1.82:1 | 1:1 | ||
| Trimatic (6 Cyl) HG | Automatic | 1.85:1 | 2.31:1 | 1.46:1 | 1:1 | |
| Powerglide (V8) | Automatic | 1.76:1 | 1.76:1 | 1:1 | ||
| 3 Speed (Sync) | Manual | 3.59:1 | 3.07:1 | 1.68:1 | 1:1 | |
| 4 Speed Opel (6 Cyl Only) | Manual | 3.317:1 | 3.428:1 | 2.156:1 | 1:1 | |
| 4 Speed (M21) | Manual | 2.54:1 | 2.54:1 | 1.80:1 | 1.44:1 | 1:1 |
| 4 Speed (M22) | Manual | 2.85:1 | 2.85:1 | 2.05:1 | 1.35:1 | 1:1 |
[edit] The M22 Gearbox:
Submission by Dr Terry.
The M22 gearbox in the HK/T/G series is a Saginaw box & is nothing like the M22 box used in the HQ-WB 6 cyl commercials. The HQ-WB M22 box is an Aussie 4-speed similar to the normal M20/M21 boxes in the HQ-WB series.
The M22 Saginaw box has the 1st gear ratio of 2.85, but the M22 Aussie has a 1st gear ratio of 3.74. The combination of the 4.44 diff & the 3.74 1st gear was fitted so that a 6 cyl 1 Tonner could still do a hill start on a steep hill without burning out the clutch even if it was overloaded.
The best diff to fit in its place for street use, would be the 3.08 & keep the M22 box. It still has a nice low 1st gear so your clutch will last but top gear is 1:1 same as any other 4-speed.
Dr Terry.
Introduced with the 1967 HR 186S, Opel 4 Speed All synchro Gearbox. Avaliable in 6cyl only, standard on Monaro and Monaro GTS with the 186S. A Weak box, originally designed for German Opel 4 cylinder cars. Even a standard 161 could break one within 50K miles.
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