901 Tranny differences? Options

[boxsterfan]

Is there some data out there on the 901 tranny differences between the years it was manuafactured?

Do all 901's have the same shift pattern?

[michel richard]

Gears from all 901 transmissions are the same (except for the number of teeth, of course !). You can take gears from any 4 or 5 speed 911 or 912 trtanny and they will fit. Actually, there are things you can't do, a third gear might not fit in the fourth gear location for example. Not sure this specific example is correct, but something to be careful about. On a four gear tranny, it 's the "first gear" that's missing. If you look at the shift pattern, it'l be obvious.

Second gear can't be easily changed, because it's part of the mainshaft. You either get a complete different mainshaft (probably 2 or 3 ratios over the years were put in second gear) or you get a 904 mainshaft, which is rare and expensive.

All 914 trannys had the same ratios. On 911s, they varied from displacement to displacement and model to model "T" , "E" and "S", plus custom racing stuff.

There's a lot of ratios available.

I have a 2.2 E engine, with a redline north of 7K. That means 90 mph in third gear. I currently have project on the backburner to shorten 3rd 4th and 5th gear.

HTH

Michel Richard