I've been wanting to gm a post apocalyptic setting, any

I haven't DM'ed it myself, but I have some friends that played a session of D&D played in the Dark Sun setting, which is post apocalyptic.

>>54180434
A post-apocalyptic setting or Fallout PNP?

In either case, yes. I personally like Fallout PNP, although I pare down the rules considerably. I nixed a lot of the stats for vehicles and removed degrees of success for skill checks and attack rolls. I also got rid of the equipment durability system in favor of a simplified food/water/sleep system (which I don't think was in the rules pdf, though I could be wrong).