[eliot92]

My car has developed a weird issue over the last week. All of a sudden when in drive, once 3rd gear is selected my car judders (like the rear wheels are struggling for traction) for a few seconds and then all is fine until the next time 3rd is selected. This happens most frequently on slight inclines/hills and under very light acceleration (harsh acceleration there are no issues).

I cant see this being a sudden issue with the tyres - its fine in every other gear and the car is already moving at around 30mph when it switches to 3rd and then judders. The tyres have good tread left, are the wider 265 size and have decent Bridgestone N rated tyres at the correct pressures.

The gearbox oil was changed just over a year ago at the dealership so also can't see this being the cause. I'm sure it has to be gearbox related though as it happens 95% of the time in 3rd gear and the other 5% in 4th (but its much more subtle in 4th).

It happened last night quite violently, on a completely flat surface, in the dry and once again I was already travelling at about 20mph when it switched to 3rd and I barely accelerated at all.

I've tried switching between 3rd and 4th in manual mode and cant get the problem to occur at all, which is also leads me to believe it surely has to be gearbox related.

Thanks for any help with this. I'm taking it to a Porsche specialist tomorrow but was interested on people's opinions on this. The fault is hard to explain, but the best way to describe it is like juddery wheel spin/loss of traction, but at slow cruising speeds, under light acceleration, when switching to 3rd gear. I did find wet roads a few nights ago did also exaggerate the issue. I've had this car for 2 years though, driven it in all conditions and never had this issue which now won't go away.

Edit: This is a 2000 2.7 986 with no traction control