Hi, After having a set of these fitted to my 2002 sti there was a massive increase of "whine" when slowly down in gear at around 2.5k rpm..
If I accelerate the noise goes and I cant actually feel any grinding from the rear.

The noise only seem to appear while in gear and slowing down - most noticeable in 4th. Is this a normal inherent of uprated diff bushings. I don't actually feel any benefit from having these.

 

Yes.

The bushes used to absorb the vibrations. They dont anymore with the new ones.

 

May go back to OEM.

 

It`s a Subaru, its all about being raw, buy a Golf if you want safe and silent,
I missed all the tranny noise etc when I went from a classic to a newage,

replace the rubber prop bushes with solid if you want to add some noise !!

 

I know where your coming from.. however if I were to sell it .. it would put buyers off..

 

Have to admit I really like hearing the diff whine after I replaced mine, but each to their own. Also noticed a real difference with feel once the linkage bushes had also been done.

Not sure I want to go as far as engine mounts last car I did that in the steering wheel looked like the legs on a fitting dog!

 

check your suspension mounting points, see this thread: https://www.scoobynet.com/drivetrain...iff-whine.html

 

Sweet jesus - that's hardcore yet oddly satisfying.

 

Lol

 

hardrace do a nice replacement, similar hardness to the oem rubber version