If it is whining or roaring when under a load or accelerating, it could be the ring and pinion gear. I first thought it was my transmission making the noise, but we got it up and it was the ring and pinion. Lot cheaper fix than tearing into and rebuilding a tranny. Parts on a R&P run about $500-700. Figure $400-$500 for labor if you dont do it yourself.
It whines when I am accelerating as it is changing gears. No noise on the hwy.
