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Message: <blockquote data-quote="cobrajeff96" data-source="post: 1508977" data-attributes="member: 29141">The clunk you hear might be "Cobra Clunk". Ford actually undersized the front bolts of the subframe in certain years. It was a genuine fuckup of theirs. I think it was a 12mm bolt whereas a 14mm bolt should've been used, or something like that. Lots of people, myself included, upgraded to a 9/16" bolt (14.2mm) which requires using a round file to ream out the holes. This keeps the entire subframe from moving back and forth, which could be what you're experiencing. You don't necessarily need the 9/16" bolts but the 14mm ones should be done regardless IMO.There's also the front rubber mounts of the differential itself as well as the slop from any of the factory bushings throughout the IRS assembly.Or it could very well be a tired U-joint in the driveshaft front or rear, or both.Not to say it couldn't also be excessive differential gear backlash either. Just depends on how much money/time you want to throw at what is essentially a nuissance. Nothing is going to be destroyed if you let it continue the way it is.</blockquote>