Model Applications
Seven Subaru Model variations fitted with Transmission Type TZ1B8LW1AA as standard, or available as a factory fitted option.
| TZ1B8LW1AA | GEE | A | CA | Impreza WRX | 227 PS | Jun. | '07 | – | May | '08 |
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| TZ1B8LW1AA | GEE | A | US | Impreza WRX Premium | 227 PS | Jun. | '07 | – | May | '08 |
| TZ1B8LW1AA | GEE | B | US | Impreza 2.5 GT | 227 PS | Jul. | '08 | – | Mar. | '09 |
| TZ1B8LW1AA | GHE | A | CA | Impreza WRX | 227 PS | Jun. | '07 | – | May | '08 |
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| TZ1B8LW1AA | GHE | A | US | Impreza WRX Premium | 227 PS | Jun. | '07 | – | May | '08 |
| TZ1B8LW1AA | GHE | B | US | Impreza 2.5 GT | 227 PS | Jul. | '08 | – | Mar. | '09 |
| TZ1B8LW1AA | GHE | C | US | Impreza 2.5 GT Premium | 227 PS | Jul. | '09 | – | Mar. | '10 |
Plot GraphTransmission Specification
Electro 4-Speed Automatic Transmission (E-4AT), fitted new to production cars from June 2007 to March 2010.
Main Transmission
| First Gear Ratio | 2. | 785 | :1 |
| Second Gear Ratio | 1. | 545 | :1 |
| Third Gear Ratio | 1. | 000 | :1 |
| Forth Gear Ratio | 0. | 694 | :1 |
| Fifth Gear Ratio | … |
| Sixth Gear Ratio | … |
| Seventh Gear Ratio | … |
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| Reverse Gear Ratio | 2. | 272 | :1 |
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| High Range Ratio | … |
| Low Range Ratio | … |
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Drive System
Full-time four wheel drive (ACT-4)
Electronically controlled hydraulic multi-plate transfer clutch (no centre differential). |
| Rear Drive Transfer Ratio | … |
Front Differential
| Type | Open |
| Ring Gear Teeth | 39 |
| Pinion Gear Teeth | 10 |
| Final Drive Ratio | 3.900:1 |
Vehicle Speed at 1,000 rpm
| Tyre Size‡ | First | Second | Third | Forth | Fifth | Sixth | Seventh | Reverse |
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| 205/ | 50 | R17 | 11.05 km/h(6.87 mph) | 19.92 km/h(12.38 mph) | 30.78 km/h(19.12 mph) | 44.35 km/h(27.56 mph) | … | … | … | −13.55 km/h(−8.42 mph) |
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‡ The Tyre Size shown is the OEM size for all Subarus fitted with Transmission Type TZ1B8LW1AA. For other tyre sizes, or for vehicle speeds at different engine speeds, see the Vehicle Speed Calculator and Graph page.
Transmissions with Matching Ratios
| TA102AACAA | Front-Wheel Drive | Open Front Differential |