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@Well_is_it
There's no trim on the SR71. Like mentioned earlier, it has various settings for the joystick that either shake it when near the maximum AOA as a warning and another that does the same but counters the movement to correct it.
I expect at Mach 3.x at 80,000 ft, it would either be on autopilot or on the setting that limits input to 7-8 degrees.