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the driveshaft seems to back out of the tranmission tailshaft at can see about 1/3 of shinny metal at high rpm's.

Since the rear tires are old Any thoughts on the problem?

Yes I remem this one, the vibration from Hell. Holler how the new tires affect it. Got enough front yoke engagement into the trans? I'm thinking tires/driveshaft or ujoint prob/yoke prob (engagement/bushing)

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