Auto Transmission Fix

For the last 2 years after driving the Deilca, finally my vehicle transmission never felt this good. At the beginning as I was not familiar to this decade old auto transmission, thinking the auto gear on the 4th was very tricky and I would have to rev the rpm to 3000 before it changes gear. Suddenly there was a time I had to hit 3500rpm. I had a feeling that my gear box was giving way.