also posted this in the creaking thread but thought this might be closer to the same issue I have with mine.... Mines been clunking in the back end somewhere since 15,000km, I told ford about it when I got them to stiffen the suspension up during this service. Its now doubled that km and have taken it into 2 dealerships, neither of them can find out whats wrong with it. First dealership (where I bought the car from) replaced the tail shaft... still makes the noise. So they booked it in to replace the entire diff... I moved and took it to another dealership where they said there was nothing wrong with the diff (old dealership said there was 15mm backlash, which new dealership said is normal?) and they couldn't find a thing wrong with it. They 'think' it might be a loose bolt in the tray body somewhere? Awesome... It usually always happens when you reverse, pull it into drive and accelerate. Also does it accelerating through gears- usually between 2 & 3rd below 50kms, and leaving at the lights. Am going to check out suspension after and u bolts but I am sure these have been looked at by ford already??? Maybe I should take it to a suspension shop?