My 350 SEL Has a bump in or under the boot when I go over the smallest speed bump.
I have checked the shocks the springs and taken everything from the boot but no luck
Could it be the mounting above the diff? I have not romoved it yet but is my
next job.
Any ideas?

The shocks have check valves in them that can cause a noise like you are describing but there were a few recalls on the mount you mentioned which is probally the culprit especially if it is a loud Thud .

a loose shock, or something else loose in the susp. the diff mount wouldnt be very high on my list of suspects. also worn shocks will thunk if over a sharp bump like that 'cause they flop down too fast.

english? boot, you know. yanks say trunk.

tom w

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.