Hi all, I have recently fitted my xr50 tubo with nolathane diff bushes. I have replaced all three bushes but now my car has a whine under acceleration which increases in frecuency with speed but as soon as I back off it goes away. Nothing else has been changed except I replaced my diff oil as the rear casing was weeping so I resealed it. I used Sin 80 oil which is the recomended oil. The diff is solid and has no play now with the new bushes and it all alligned perfectly. The car is only 13000kms old so I wouldn't think large pinion bearing would be at fault. Anyone got any ideas on what may be causing this?