Hi i have a 99 forester with a manuel transmission. I have a problem with my differential once the car gets hot. It doesnt do it in the morning or when it is cold. The problem is that when im turning into a driveway or around a tight turn you will hear and feel a thud thud thud. I assume is the diff trying to compensate for the differnt wheel speeds. I change the oil in the trans thinking it was a viscosity problem due to it happening at high temperatures. I replaced it with 75-90 but no luck. Has anyone expierenced this and ficed it with some kind of any slip solution? Any input would be helpful...thank you very much.

My 02 wrx does the same thing , I just wondered if it was because the tires and road were hot, giving alot of grip while turning.