I brought my p/u into a repair shop to replace my tranny cooler. Since then I am getting the whining noise upon acceleration. You know when you hook up a stereo the wrong way.... you get that feedback whine. It sounds like that. I brought my p/u back to the shop, and the owner/ tech says its the air filter. I disagree. He also suggested it might be turbo bearings... but wanted me to get a 2nd opinion. Has anyone ever had this noise occur?

 

stock turbo dont have bearinds, its spins on oil and air filter than whine much? dont think so,my turbo whine but when its at 40+psi its normal