At speed on a constant radius exit ramp, the car presents an oscillating yaw. It only does this Hula near 8 tenths. I don't feel it in the steering wheel and it seems to be coming from very near the wheels. This rhythmic, variable lean seems most noticeable at high speed. Tires are balanced and properly inflated, 4 new Bilstein shocks, 4 wheel alignment done. Problem persists. I was hoping someone could advise.

 

dellavar, assuming you are not having a steering wheel wobble mixed in with this, odds are, you have a rear control arm that has worn bushings. Odds are, you are looking at one (both) of the lower/forward arm(s) in the rear suspension being the culprit.

Normally this will present itself on a long, sweeping turn. If you get into the turn and then give the car some decent gas (like you were going to overtake a car in the corner), you will feel the rear end start to step out on you. This will confirm the arms that I am talking about.

 

I found some for sale by SNG on ebay for $90. Thermo can say if these are the right arms or not. I hope they are, I just ordered them for my car.

Jaguar x Type Rear Suspension Front Lower Control Arms Pair C2S50863 | eBay

 

slxj, yes, those are the correct arms for our car.