Did you replace subframe connector bushings? Common symptom when going over a bumb, like a speed bump or driveway curb, is a clunk noise from the floor. Typically it is the rears, the ones closest to your feet, but can also be the fronts.
Saved by the Cross! Bled by a Taurus...
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Vulcan I - '97 Silver Taurus GL
Vulcan II - '97 Forest Green Taurus GL
Vulcan III - '02 Tan Sable LS
SHO-HIS-Love - '96 Medium Willow SHO
SHO-Foo - '96 Medium Willow SHO