Thread: Ford 9" Whoa's

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I think DennyW is probably right. I had a vibration on my '79 1-ton 4x4, described much the same way. I punched the throttle on the freeway going 65 mph when that front u-joint, or whatever was out of balance, finally let go. There I was with the front of the driveline smacking the freemay coasting to a stop. I'm lucky it didn't roll me, it was just a tube bolted to the rear axle, I never found the other parts that let go. Any vibration I've ever had has either been a tire out of balance or driveline related.

As to your current axle, I think it would be cheaper in the long run to beef up your current 9 inch rear, rather than start with another one, jmo.

Here's another thought, the more I think about it, the more I think your vibration IS driveline related. Do you launch it hard and such? That's a big motor, and I'm tending to think your driveline might be ever so slightly twisted.....anything is possible, however.