Can anyone tell me what the air pressure should be when the 4WD is activated? I get a loud clunking in the front left axel when making sharp corners in 4WD. I have already had to change the carrier because of the right side seal failure. The clunk was there before. I thought with the entire front diff replacement (Used), the problem would be solved. I have tried another actuator but the pressure is the same. About 4-5 lbs. Is it possible that it could be the letf outer CV? The noise is only there in 4WD.