86 5.0 With Aod Redline?

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Hi I have a 86 5.0 motor in a 94 mazda b4000 truck. It has a 83 aod tyranny in it. I finally got it running good and am wondering where those motors redlined at. My pickup tach redlines at 5k but I hit 6k rpm and the tranny still hasn't shifted unless I let off a bit. Anyone know where the aod's shifted at when floored? I don't want to burn up the motor.