901 gear ratio question

[Patronus]

My 1968 912 has a 2.7 engine, rendering it a 911 again (I firmly believe). However, it still has its original 912 gearbox (901).

I wanted to put in a 901 gearbox from a 911S or something, to improve the gear ratios, but now someone told me that a 912 box is in fact a 911-S 901. Can this be true?

Will I really gain by swopping my 912-901 for a 911-901 box?

Its top speed is just below 130mph, but according to specs the car (1947 2.7S) should be capable of 142mph. This means that my top gear ratio is wrong. Right?

[masraum]

I believe the '74 cars were using the 915 weren't they? Actually I just looked it up and the 915 was introduced with the 2.4 in '72. The main problem that I see is keeping the 901 in one piece when bolted to a 2.7. The reason Porsche kept changing trannies over the years was to keep up with the torque of the larger motors. I'm sure some of the guys on the 914 board/list could tell you how to beef it up to handle the extra torque. Also you could always change gears. If you are going to change trannies it would probably make the most sense to go to a 915, otherwise stick with the 901 and it's cool racing shift pattern.

[Oldporsche]

901 gear boxes had gear ratios that could be changed rather easily. You will need a 904 input shaft however to change the internal gear ratios. There are locking differentials avaliable for it. I remember seeing a early 911S with all of its ratios being less than 1:1. The owner told me that he just liked it because it would keep accelerating.

Good luck,
David Duffield