Right here we go! my on going problem! is it the rear diff?

From cold there is no problem atall, but once warm ie if ive been on the motorway i get a bloody horrible clunking when going around corners, feel it right through the car. ive done a bit of investegating and as far as im aware, its an open front diff and a viscous rear. ive changed gearbox and diff oil for motul gear300. and its no different. my next move was going to be to change the rear diff but before doing so wanted any second opinions really, like has anyone else sufferd these simptoms?

 

A viscous diff will need a special viscous diff oil.

Is it not a Limited Slip Differential/LSD, though these also need special LSD oil.

 

well apparently this oil is fine unless anyone knows different? MOTUL GEAR 300 is whats in it.????????????????????