As far as I have read, 998s could have either gearset, depending I guess on application. But Also as far as I have been able to figure out the 998s were not lock-ups.
So if you have a 998 that has a loc-up, it would seem to be an oddity. At least to what I know.
So with those assumptions, I would think your trans should have the 2.74-1.54-1.00 set
No experience to back any of this up.
I got my low-gear set out of a 999 behind a slanty. I just transferred it into a 904 SBM case, and got rid of the lock-up in the process.
If anyone else does this, be sure to keep the M/S with the planetaries together as a set. If you put those A999 planetaries on the 904 MS, you might get 25 or 30 miles out of them, after which the MS will rip all the splines out of the back aluminum planetary, and you will be walking. Dangit.
