Vibration 86 Spider

[Forza <headroom@domain.elided>]

Hello, It's been a while...  All has been well with Lena Until......

Yesterday upon exiting the highway, I noticed a vibration which I first 
believed was a tire going flat.  Upon inspection all was found well with 
the tires.  I drove the car for a while finding the vibration did not 
persist when the car was out of gear, so I'm guessing drive train 
problem?   It's is a fairly high frequency vibe, not a trumping, it is in 
the body and shifter and not so much in the steering wheel.  It's strange, 
but I guess things happen when the happen, but I was driving all night.  I 
had just comment to my wife how beautiful this 16 yo car was running.  I 
didn't downshift hard when exiting the Hwy,  I heard and felt nothing until 
the vibe began.... something had quitely let go???

The car has new motor mounts, tranny mounts, donut, front wheel bearings, 
the entire front end has been rebuilt as well as the tranny (clutch 
pressure plate and bearing) with factory parts.  The only two part item I 
know I haven't repaired or replaced are the rear-end, and the rear axle 
bearings. The center bearing bracket brace was modified when I installed 
springs which lowered the car.. and I was parked at a strange angle for 
three hours during diner..Could this have broken the bracket or donut?

Please lend me assistance in trouble shooting this problem.
Gabriel Forzano
86 Spider Veloce
South Florida
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