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Message: [QUOTE="kleake, post: 1466731, member: 25987"] Ahhh, found the issue, and it may have been at least part of the source all along. Pinion is loose in the axle...... Read on for details: Dropped my driveshaft off at [url]www.driveshaftsoftulsa.com[/url] and had them convert it to a 1-piece using my components, but put in new u-joints at the same time. Got it back, and it looked excellent and the price was good. (These guys do excellent and fast work!) Installed it and noticed all low speed vibrations were COMPLETELY gone! WOOHOOO!!!!! Got up to 65ish and felt a little vibration, but when I backed off the throttle, it vibrated a pretty fair amount. Did this a few times to test and determined that at as low as 50mph, off the throttle it would vibrate. None was extreme, but would catch your attention. Since it used to be butter smooth at any speed above 20mph, I thought it may be out of balance or that my slip-yoke was worn since they re-used it. So I took it by their shop and they put it up on a jack and took a look and found the yoke to be very loose on the axle allowing the shaft to wobble! :eek: They snugged it up for me as a temporary fix and that solved 95% of the vibes at speed, BUT I will be looking at this more. Bad bearing possibly? Gotta do some research on the pinions on these Sterling axles now. 237k on the truck, i'm sure it's due for some service. It is odd that I used to have 0 vibes at speed, but did upon takoff, and now it's opposite. :doh: Anyone know if the sterling uses a crush sleeve or just torque it back down? I plan to at least inspect it before I torque it down and hope I don't have to replace the inner bearing since that requires a lot more teardown. [/QUOTE]

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