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Message: <blockquote data-quote="GDTrumbo" data-source="post: 608912" data-attributes="member: 10665">With a 4-bolt flange at the rear of the driveshaft, it could be rotated in 90* increments. But I'm sure there is a "sweet spot" there somewhere.With the vib stopping when put in neutural, it kinda rules out a twisted trans output shaft since it spins at DS speed in neutural or drive. Some owners think neutural slams are cool.Ummmm....  There's many things spinning that could contribute to a driveline vib. You might:Do a quick inspect of the harmonic dampener. Look for rubber sticking out/seperation. Does it vibrate sitting still in neutural at 2500 or 3000 rpm?Pull the DS and check the U-joints for good articulation. Especially the front one where the jolk was installed.Your idea on the rear UCA's is possible. Look for bushing damage. OEM replacements are no longer avalable for '97's from Ford as of 5/08. Would have to go with FRPP replacements.Gearsets anywhere below 3.73:1 & 3.90:1 tend to roar a little and gearset installs are no less than an artform. They can be the difference between a 30K lifespan and an indefinate lifespan. There's a chance they are not set-up quite right.See what you can find.GT</blockquote>