Hi folks. I have an 88 V12 XJS 5.3 auto which has been running great until yesterday. Whilst driving home it suddenly started to rev whilst in gear at 60 mph and then no acceleration. When my speed dropped down to about 20 mph it started to drive again but won't change gears. Its now stuck in 1st and won't change at all but goes like a rocket. Ive checked the fluid on the dip stick and it shows full and there are no oil leaks either. The gearbox is the standard auto box that was fitted to the car when new. Any ideas before I start pulling it apart (aside from scrapping it. lol)
Bob