4th gear whine

[green123]

hello does anybody kno wwhy my car whines in 4th gear when its gets to around 40 mph + its really bugging me now i changed the oil on the axle as i thought it could be that im shure its not the gearbox had a replacment engine and it still does it anybody got any ideas

[Neil MG]

Does it whine all the time, i.e. when under load and while coasting, uphill and down? Does it stop if you depress the clutch? Is there any difference if you corner? or touch the brakes?

If it is differential whine, caused by wear, then changing the oil will probably make no difference.

[green123]

it only whines when foot on revs if you free coast it dosent whine does still whine when touching brakes and dosent when cornering as slow down does this help?

[Neil MG]

sounds like it might well be the diff. Does it continue to whine at higher speeds?

[bmcecosse]

Sounds like Diff to me........