Mystery vibration at 25 mph can't be diagnosed. It's not the front end!

slantsixdan said

Yup, I'm with Mopar Tim. The vibe on acceleration at 25 mph or so points a big, flashing red neon arrow at the ball & trunnion front U-joint. You can still get the parts to overhaul them, but it's an expensive nuisance, and finding the knowledge to do it right is even harder. Instead proceed this way.

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I bought a 63 Fury last year and it has a similar sounding acceleration shudder which I suspected was the B+T but wasn't 100% sure so this is really good to know.I'll definitely use that method to fix the problem as opposed to trying to track down replacement parts for the B+T.Thanks for the link.