Evening all just back fro France 2500 miles round trip and have developed a steering wheel wobble between 80 and 90 mph now it is not always there so anyone any ideas going to rebalance wheels tomorrow but wondered if it could be prop or front diff? Problem is sometimes it goes away so a bit of a loss at the moment

I had a wheel wobble at 70 that wheel. Alan I got didn't cure which turned out to be a sticky front calliper that was overheating. I rebuilt it and has been ok since.
When I stopped after a reasonable journey the NSF disk was over 100 deg c and OSF was about 35 from memory
You could have lost a wheel weight though