1990 Ram 50: in the HOT desert - which radiator cap?

[geezer101]

Don't go to high PSI rating caps, especially if your engine is going to experience stress from high temperatures. I'm an ignoramus on the cooling system in the gen 2 trucks, but if it is running a water pump pulley driven clutch fan I'd be upgrading to an electric thermo fan. If your engine is gonna bake, it will do it while sitting in traffic as the fan will only flow air at low speed. Easy to set up, cheap to buy, frees up engine bay room, way more efficient, saves your water pump bearings and will yield an improvement in throttle response.
What's not to like?