Replacing output transistors (mosfets)

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Those mosfets came from a punch 40.2 that I got a whole back it had a blown power supply but none of the outputs were damaged I had used one pair for testing a project amp and left the other two on the board. I wanted to use this punch 55.2 to run a 10" kicker comp single 4 ohm coil sub in a box I'm making. Or use it power speakers.

The parts are made by Harris semi because it has the 'H' printed on them.


Note: I installed them in and it so far it's playing ok I guess I have connected to some test speakers that are 6 ohms on each channel playing full blast. Reaches what I would consider normal operating temps? Hasn't shut off or anything.
 
Well if it works it works. Like Perry said there is no telling how hard the used outputs you installed were driven. It may last a month it may last for years. Put it in your car and run it hard for a few weeks if it does not let you down I think it will be fine.
 
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