[immortal_suby]

Its possible that they put in a different final drive tranny. Either that or your torque converter not locking could be the only cause of the raised rpm. You should see about 2000 rpm at 60 in lockup and that will go up by about 400-500 rpm when the torque converter is not locked.

A legacy tranny has a different final drive ratio than the svx so swapping one in requires the changing of not only the transmission but also the gears in the rear differential. If the rear diff gears are not changed then the awd will bind and eventually stop working. This happened to a member here and it was a long time before he realized his awd wouldn't work and that the tranny was from another car.

The svx final drive is 3.54. The legacy or impreza or forester range from 3.70 to 4.44. The low 3.54 drive in the svx allows for those 3000 rpm at 90mph cruises, while the taller gearing in the other transmissions will raise the rpm - like you are seeing.

It actually is common now and considered an upgrade to some to get a legacy or impreza transmission swap. People like them for the taller gearing which gives faster launches but it does heighten cruising rpm and will lower highway mpg. Part of the swap is changing out the ring and pinion gears in the rear differential to match the new tranny. You'll see many threads on here about 4.11 or 4.44 tranny swaps - these are the legacy and impreza trannys.

I would take your svx back to the place that did the work and have them figure out why the TC is not locking first without mention of the possibility of a legacy tranny in there. It could be something as simple as a temperature sensor. Once they have fixed the lockup issue check what rpm you are running at 60 and 90 - should be 2k and 3k and if that does not match then take it back in and raise hell.
good luck!