Hi looking for some help with a problem Ive just developed my cars an 03 blob STI, when accelerating I get a whining noise between 40 - 45 then it goes away and only happens at this speed and doesn't effect performance, but also when hitting anything above 70 the whole car shudders and vibrates both things stop when you lift off the gas and start back again when back on the accelerator, Dont think its a wheel bearing as it doesn't change from turning right/left and isn't a constant drone.

Any help much appriciated as its doing my head in

 

i have exactly the same issue on my car at the moment (a 2003 JDM STI), its suspected to be a centre differential on mine (DCCD), if your car is a UK car it wont have DCCD but could be anything transmission related by the sounds of it, gearbox, clutch, front diff etc.

Best bet is to take it easy and get it checked.

 

I'm far from mechanicaly minded but to me it seems like the prop shaft area but its hard to pin point being in the car