The 901 is still going to be cheaper than the 915 flipped for our cars. If you can part with the cash, the 915 is really nice, but a tad pricey. I should know, I just finished a 915 WEVO box for the teener. Not counting the cost of the box, I had $5100 in parts and $2200 in labor. For your $7300 you get:
new synchros and seals and bits
new Guard 80% LSD
WEVO 914 conversion side shift rear housing
WEVO Gate Shift
New bearing retainer plate made from "weapons grade" steel
2 new gears 2nd and 5th to close up the ratios for the track
machine work for an external oil pump
You can cut down the parts by $2600 if you leave out the LSD, Gate Shift, and 2 new gears.
That being said, the box looked absolutely beautiful after it had been assembled. I basically cried when I sold it last week....
But it's going to a good home in a nice 914, so at least it is appreciated.
So I'm not down on the 915's at all. I just wanted to share my build with you for comparison. My previous rebuilt 901 with reinforced intermediate plate and all new syncro's and KA-Q-V gearing cost me $1K when I found a guy going belly up on his project. I bought a Guard 80% LSD for $1400 and had it put in, so my 901 "built" box was ~$2500.
Datapoints for you.
Either way you go, a rebuilt trans really shifts nice!
Bill P.