I've had a fairly nasty vibration in my truck as well. First the u-joints went and that vibration was absolutely violent. After we took the driveshafts out and replaced them, it didn't occur to us that we needed to put them back together exactly the same way. Ever since I've had this strange vibration that only happens when I have my foot hard on the gas or am off it and/or braking. It's perfectly smooth if you match the engine to your speed.
I think i'm going to try that vibration diagnosis in a little while. I hope I don't have to take those damn driveshafts apart again. Putting those u-joints back together is definitely a pain.
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