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I have what I beleive is a bad driveshaft causing low vibrations mid-car area. I have searched the archives (no luck) and the haynes manual says the diveshaft is not servicable. Is there anyway to change the universals on the driveshaft. Can I do this myself or do they need to be pressed out. Would like to know before I break my back under the car.

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Check Your MOUNTS!

I had a similar vibration on my 74 260. Really bad in first and second above 4000, third and fourth wasn't so noticable.
Thought driveshaft imbalance.
Found bad transmission mount, and a diff mount going bad.
Everything flexed or moved just enough to put the joints in a bind and cause a vibration. Replaced them both and it was cured!
I have a 2+2 driveshaft that you could shorten if you want it, but shipping would probably cost more than getting one out of a scrap yard!
Inland Empire Driveline Service (iedls.com) can make up a nice custome aluminum unit, or rebuild your stocker with REBUILDABLE u-joints for a reasonable price.
My aluminum driveshaft with HEAVY Spicers was only $350, and balanced to 9000rpm!
 
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