Quote:
Originally Posted by the_welfare_wagon
I’m not 100% on this answer but I would give your Ujoints a check to rule them out. I had my ujoint pretty much disintegrate and the vibration was pretty bad though I felt nothing in the steering which is why I’m hesitant to say ujoint
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That is the first thing I would check, too. I had this problem 10-12 years ago, and found the vibration
very unsettling. I though my engine was about to grenade. If it happens only when driving, and not when just revving the engine, then the problem is likely not an internal engine one. Could be engine mounts, though.
To determine if it is the u-joints, crawl under your rig, grab the driveshaft at every u-joint, and try to wiggle it side/side and up/down. If you feel or hear any looseness, then that is likely the problem.
Trouble is, the problem is either expensive or a PITA to fix. I had to surgically cut and press out my OEM u-joints, then install new ones. The new u-joints that I used are both removable and serviceable (with Zerk fittings). If I keep them greased, they will never wear out. If I don't, and they do wear out, then they will be relatively easy to replace again, since they are designed to be removeable. Back then, the u-joints were about $50, and the small bench press I bought was about $50. That $100 total, and a few hours, beat the living snot out of $1,500 for a new OEM driveshaft. (This is all from memory, and I don't recall which brand of u-joints that I bought.
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