It's strange that the datasheet of the mosfet i think it's in (reading his name) says it should work.
What makes you say that?The data sheet you posted on the first post quite clearly says it requires 10V to fully turn it on, in the Rds(on) line.You are making the classic beginner mistake of thinking the Vgs(th) threshold of 4.0V is only the point where the FET starts to turn on, not when it is on fully.
I would never try to use 5 volt gate drive for a standard power mosfet.
I just need 4-5 Amps, so I've looked for fig 1 pag 3, in which one you may see that 5 Volt allows 5 amps passing in without entering in the saturation area, therefore having the little resistance you expect from a conductor.
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