| HQ Holden Trimatic transmission ID codes – each code has a different number of clutches and valve body differences | ||||
| Engine type | 173 L6 | 202 L6 | 253 V8 | 308 V8 |
| Transmission code | HN | HT | HO | HP |
| HQ Holden Turbo Hydramatic 400 transmission ID code | ||||
| Engine type | 350 V8 | |||
| Transmission code | EH | |||
| HQ Holden Automatic Transmissions – gear ratios | ||||
| Trimatic | Turbo Hydramatic 400 | |||
| Low | 2.31:1 | 2.48:1 | ||
| Second | 1.46:1 | 1.48:1 | ||
| Drive | 1.00:1 | 1.00:1 | ||
| Reverse | 1.85:1 | 2.08:1 | ||