Laur3ns

So I have this loud singing/whine from rear just under 40mph.

Diff?
Wheel bearings?
Or just my Toyo R888s?

It's fairly low pitch, if I had to guess around 800Hz, a bit like this .WAV at the end: http://www.e2s.com/45%20tones/tone42.wav

Around 37-38mph (60kmh) it's the loudest.

It is totally unrelated to throttle/clutch position and gear selection. I haven't tried cornering yet.

bryanlow

iTrader: (10)

Take a test drive and weave left and right. If the sound changes with wheel loading it is probably a bearing. You can also check the bearings by jacking the car up and checking for play. You should feel very little or no play in the wheels.

Laur3ns

Did a bit of slalom and it doesnt seem to change the noise...
NEED MORE INPUT!

jedduh01

iTrader: (4)

Jack the rear, run it in gear... tire noise will go away. Can leave in gear and listen to bearings and diff.

Goodluck

Or swap tires out.