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Last edited by crafferty; 03-20-2017 at 05:13 PM.
If you can check for repair history, look for any work done to the CV Joint flanges like seal replacement. In most cases a C-clip is used to secure the drive flange to the differential gear. There are instances where it breaks off from it's perches and gets chewed by the diff and flange, causing the front end to vibrate only during acceleration. No clunk, no worn ball joints and every thing torqued to spec except for this weird vibration during acceleration, beware, this problem can cause baldness trying to figure out.
I've experienced it myself after I replaced my diff seals, who would think this could happen when no tell tail sign a problem happened in there unless you check that the clip or whatever is holding the flange to the diff is actually there holding it securely. I found everything holding it down was chewed up into a single ball bearing about an inch in diameter, that's what causing all that vibration. Now another scenario with an opposite effect, this time during deceleration a vibration occurs. It could be a loose engine mount, specifically a tranny mount not meeting it's torque spec's. Hope you don't pull your hair trying to solve this, hope this helps.