I know these things are getting rare, but I did get a come back from one a few years back on a newer vehicle. It smoked the 2nd clutch within a couple hundred miles and I found the 1-2 accumulator piston worn to high hell. They have upgrades for this now, I missed it when i put it back together, but this is a something that defiently needs attention. It isn't related to killing the engine, I just thought it might give a little help to anyone running a 3speed Sonnax - Aftermarket replacement transmission, torque converter, and high performance automotive parts i think they have the info on the accumulator problem.
I didn't mean for this huge text to show up for the sonnax website. I just wanted to let you guys know where you could find some helpful info on tranny tips. Tell this site that sonnax owes them some bucks