I have a 1997 850r. Car not moving in any gear...sometimes. Mechanic says I need new transmission. He doesn't do transmissions. Have been reading posts about trying PNP switches and flushes first. Mechanic doesn't think either will help. Is there something different about the 1997 trans from, say, the '96, '95, '94? When is it obvious that only new trans will do the job?