I have a 1993 4wd 22re, runs good and solid. It started making a high pitch squeal at high RPMs. I have new belts, and I recently sprayed belt dressing on them to try to alleviate the problem, no luck though. I have not steam cleaned the engine, due to its age and the fear of doing some type of damage, (thinking dust may be the culprit). Is this a "warning" that something may be about to go out, bearing?, pulley? timing chain? I dont have a tach, so by high RPMs I mean 30-35 mph in 2nd gear, it squeals just before the shift into 3rd. This morning it squealed at 42 just before the shift into 4th..Thanks for any info.