The Porsche G50 5-Speed Transaxle (911 Carrera 3.2 1988–1989) is a five-speed manual transaxle.
First gear is 3.50:1 and 5th is 0.892:1. Divide one by the other and the overall spread is 3.92:1. That is a middling spread for a five-speed: enough first gear to leave a junction without drama, and a top gear that is not only for motorways.
5th is an overdrive at 0.892:1: the output shaft turns faster than the input shaft. No gear is exactly 1.00:1, so there is no direct drive.
The biggest step is 1st to 2nd, where the ratio drops 41%. The smallest is 3rd to 4th at 20%. A drop that size lands the engine well down the rev range after the change, so it pays to know where the torque lives.
It is a transaxle, so the final drive sits in the same case: 3.444:1 as listed here. The speed table uses that figure and nothing else. With a 3.444 final drive and 225/45R17 tyres, 5th at 6,000 rpm works out at 234 km/h (145 mph), and first runs out at 60 km/h (37 mph). At 70 mph in 5th the engine turns about 2,890 rpm.
Nearly the same box as the Porsche G50 5-Speed Transaxle (911 Carrera 3.2 1987): 5th is 0.892 here and 0.889 there. That page is the one listed for search; this one stays for anyone after this exact version.
Ratios
| Gear | Ratio | Step |
|---|---|---|
| 1st | 3.50:1 | - |
| 2nd | 2.059:1 | 41.2% |
| 3rd | 1.409:1 | 31.6% |
| 4th | 1.125:1 | 20.2% |
| 5th | 0.892:1 | 20.7% |
| Final drive | 3.444:1 |