OP don't worry and drive it hard, these cars were engineered with a lot of durability.
the transmission is a stout unit, check out supra forums they use the nissan 6 speed manual in their supras, our 6 speed is stronger than their r154 5 speed manual.
the engine is bullet proof, a lot of people are running FI on their engines for thousands of abusive miles.
If you are stock or just N/A then you have nothing to worry about.
The weakest link in the entire car is the clutch hydraluic system (mainly the CSC), everything else is solid.
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