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Message: [QUOTE="kleake, post: 1467706, member: 25987"] Well, the saga continues........ This shouldn't be this difficult! I pulled the flange, inspected/felt the bearings and all checked out good. Put it back together and I still have driveline vibrations at 65-75mph. Anything below that is smooth. Took the driveshaft back to the shop, they adjusted the balance but say it is perfect and no more than .002 runout on the whole shaft. I put it on the truck and i can see approximately 1/8" runout towards the rear half of the shaft. I put it on jack stands and run it up to speed and right at 65-70 you can definitely feel driveline vibrations that were never there before. After 75 they slightly diminish, but remain up to 100. They aren't 'bad' but enough you can slightly see it in the mirror and you can hear it as a drone is there. I'm not being picky and I am sure this will work, but over long term I don't like it especially since those are the speeds I drive every day and it's going to cause other issues. Per the driveline shop, they say the only thing at this point they can do is go back to a 2-piece shaft. Any other ideas of what might be happening? Questions: 1. Both small weights are at the ends of the shaft, but could they need to move a weight to the center of the shaft? 2.Could the slip joint be flexing at speed? 3. Why does he not see any runout on his machine, but I can see it on the truck, and both flanges have zero runout? 4. Should I just have him build me a complete brand new shaft? Aluminum for lighter overall weight? Or just go back to a 2-piece and fix the carrier height to fix the low speed shudder. Video of what I am seeing on the truck. I move around on the shaft, but I see the most runout in the very center: [url]https://youtu.be/draBgtzSnDg[/url] [/QUOTE]