Speeds at 4000 rpm in 4th gear
4.37R&P = 73MPH
4.125R&P=81MPH
3.88R&P =82MPH
These are with a 25inch tall rear tyre
The big difference in the 3.88 gearbox is the splits between the gears. 1-3 are longer than in the other boxes and then 4th closes up. Good box for a small turbo engine, but not for a 1600.
4.37R&P = 73MPH
4.125R&P=81MPH
3.88R&P =82MPH
These are with a 25inch tall rear tyre
The big difference in the 3.88 gearbox is the splits between the gears. 1-3 are longer than in the other boxes and then 4th closes up. Good box for a small turbo engine, but not for a 1600.