Probably partly both. It's a secondhand, but even brand new old-school Suzuki automatics slip like hell. I had a van for a week that never locked up the torque converter in traffic... EVER. Annoying, and expensive to gas up.
The short gearing does play a role, but if it was only that, simply never going above 60-80 km/h should do the trick. I don't think it will.
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