RyeThomas

First off my truck runs great, but when I start it up in the morning an enable the high idle it is fine unless I bump the rpm above 1300 I eventually get a horrible grinding noise from the lower rear drivers side of the motor. Any ideas, as soon as I drop it below 1300 it stops. What could it be?

53 willys

power steering pump??
Next time kick it up to 1300 pop the hood and find out if it's in the engine or something outside like an power steering pump.