I was one of the guys that motored my trans after a servo install I burnt 3rd and 4th gear 2 miles after putting it in, but is was a sweet 2 miles But my trans had 140k and I push a ton of hp
Rebuild time for the ones who did have a problem if I recall. Some have had problems with installing the servo itself but that is a different issue. The issue with installing just new high perf servos is that you change the dynamics in a tranny and now risk stressing out even further the parts that are already high mileage worn. Everything I've read and the guys I talked to say its about a 30% chance like I said earlier, the odds are in your favor but it's high risk in my opinion. If you blow your tranny, you can always find a used one if you can't cough up 2-3k to rebuild.
B