trans gearing ?'s Options

[ottox914]

OK, here's what I know, and would like to know. Our 901 has a 2nd gear that can't be changed w/out alot of $$$. If I want a shorter 3rd gear, the shade tree method would be to "flip" a 5th gear set.

If I want a taller 5th gear, would a "flipped' 3rd gear in the 5th gear location be taller than the factory 5th gear, and calm things down on the highway at 80 mph?

Yes, it might make for some odd gear spacing, I'll have to think hard about that as well, but as the car is mainly an auto x toy, the short 3rd would be nice, and a taller 5th for the trip to and from the events would be welcome, although the 3,4,5 spacing might not be so good for a track day.

[sww914]

The ZD 5th gear in the 914-4 trannies is the highest 5th that Porsche made for 901's. That's the one that people flip around for a KA 3rd which is almost like an M 3rd. The 914-6 5th is a ZA which is even lower. If you want a higher 5th you'll need bigger OD tires or a different ring and pinion and either will make all of your existing gears seem higher. There might be aftermarket 901 gears available at some point, I head a rumor that a tranny parts manufacturer will be producing brand new gears for us in '09 but I don't think that they'll be cheap, nothing is except Top Ramen.