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What I'm understanding you to say is you converted your ECU from an automatic transmission to a manual transmission, and now your engine redlines at 7700rpm...
What I would do first, if I were you, is double-check your auto-manual conversion. 99.9999% of the time when your engine redlines below where it should, it's wiring related. Check the ECU, and double-check any other wiring you did when you swapped the motor.