Just got off the phone with them.
In their own words "5th is a mother to replace".
They've got two of the .90's but were of the opinion that it wouldn't do me a lot of good if I have to upshift halfway down the straight at BIR, but it could be workable if I change the rearend to 3.55. They've got nothing in stock taller than .90 until you get to .73, which would be just as useless as the .68 in it.
They don't have any trannies in stock ready to ship with the .90 either.
Guess what I'll do is see if I can locate my 3.55 gearset and put them in, and just live with that since I really expect this car will only see track use until late next year when the 2007 Mustang GT500 Shelby Cobra is supposed to be out.
Besides, the cost and labor to make the Mustang's 5th gear usable is a substantial chunk of what it'd take to turn the WRX into a 365-hp firebreather.
BTW, speaking of the WRX, I put a new set of gForce TA/KD tires on it for BIR and got 225/45R17 instead of 215's. I won't know until I'm on more familiar turf whether the KD's stick better than the KDW's I was using, but at least they got nicely scrubbed down without the chunking I was getting from the KDW's.
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