FOXCONN4

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90crvtec

If your diff is already bad changing the fluid won't help. The symptoms you're describing do sound like a bad diff. When you pulled the drain plug in your differential did you notice any large metal bits stuck to it?

ronnuke

Wouldn't the whining continue even after the clutch was depressed if it was the differential?

Maybe noisy clutch?

Or even rear brake calipers sticking, or worn rear brakes ready for replacement.
Are you coincidentally stepping on the break while depressing clutch causing the rear brakes to no longer be just dragging but making full contact with rotors and hence not whining?

Could be a lot of things. But these are all possibilities. HTH

BlownAP

dose it happend when your decelerating? leaving the car in gear and clutch out??

chris_barry

I had this on my 2000 model diff. All the teeth on the pinion were unwrapping themselves. A bit like when you wind a curtain rope the wrong way.

I would put the car on stands, and run it up with the wheels in the air. Hold a screwdriver with the blade on the diff, and the handle against your ear. This acts as a primative stethescope and allows you to chase the noise.

If it sounds like the diff, disconnect the propshaft from the diff. Best method is to snap free the allen headed fasteners with a quick snap action. You can then spin the wheels by hand and listen again. Disconnecting the propshaft eliminates any gearbox/propshaft noise.

Good luck

Chris.

chris_barry

Have you run the car up while on a hoist and listened to where the noise is coming from? Use the brake gently to load up the driveline.

You are going to have to do some more diagnostic work at your end. My crystal ball is away getting its galactic flux diodes upgraded at the moment.

If the noise pitch to road speed ratio stays the same, irrespective of what gear you are in the problem is either in the differential/rear hubs or the output stage of the transmission.

Keep looking.

Dabutkus

I'm pretty sure it's your diff man. The same thing happened to me. It seemed about 30-35 mph is when it would start. Usually 4th gear too. It would get louder and louder as the speed increased. I don't remember if it stopped when I pushed in the clutch though. I had almost the same mileage as you do also. I think I was at about 61k.

Good luck!

pastfast125

Well, everybody has already givin you quite a few things to try, have you done them yet? I think it would be best to listen to them and try to diagnose the problem rather than randomly replacing parts untill it works. just my .02

SpaZilla

im hearing alight whine as well but it doesnt really get higher with the speed, removed all the sound deadining behind the seats byt he fuel pump, im pretty sure im hearing the fuel pump