I have a '91 Toyota pickup, manual trans. 187,000 miles. A whinning noise seems to be coming from the trans. The noise is not there, when your on the gas, just when you let up on the gas, you hear the noise. If you push the clutch in when the noise occurs, the sound goes away. Let the clutch back out, it comes back. Plus the rear pinion seal is leaking now. Could it be a bad bearing in the trans. or the rear pinion bearing making the noise.