Vibration source chasing

Adamhach

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May 17, 2024
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Hello all, I am new to this forum as I am at a loss for what to do and where to look next to find this vibration that has been persistent for about a year now. 2002 Silverado 1500 LS 4.8L 2WD 4L60E Extended cab 365,000 miles. The vibration feels like a paint shaker is in the cab at speeds anywhere between 35-45 mph and reappears around 65 mph. The vibration is present at acceleration and deceleration while in gear or in neutral. I've had the truck for around 7-8 years and this vibration ha developed within the last 1-2 years. Since the vibration has began I've replaced:

-Multiple tire balancing and rotations
-At least 2 alignments
-Both front wheel hubs with MOOG/Precision hubs
-Both rear wheel bearings and seals with Yukon gear bearings
-Both axles shafts with Yukon axles. The originals were well worn and pitted beyond repair.
-All 3 u-joints in the two piece drive shaft. Front u-joint with a Precision joint and the rear 2 joints are Spicer.
-Center carrier bearing with a Precision branded one.
-Both slip yokes have been cleaned and regreased.
-Transmission mount
-Both rear leaf spring sets have been replaced with new sets as the old ones were worn out and 'W' shaped.

I haven't touched the engine mounts, timing chain, harmonic balancer, the trans extension housing bushing, any of the ball joints/ a-arms, or tie rod ends.

The front end components appear to be tight despite most of the boots being busted on them. I can't get any in/out play from the tie rods and no up/down play from the ball joints. The control arms bushing aren't cracked from what I can see. As far as I can tell the a-arms assemblies, upper and lower, are original to the truck.

I feel a very slight vibration in the steering wheel when the vibration is at its worst at ~43 mph, but the vibration feels like it's coming from under the truck which I don't understand. I've attempted to move the pinion yoke to check for a bad pinion bearing, but the yoke appeared to be tight. I am unsure of the carrier bearings in the differential. The differential is original.

The engine and transmission are original to the truck as far as I know and have had regular fluid and filter changes since I've had it for the last 130,000 miles/7-8 years. The previous owners also kept it well maintained with regular changes, or so they say.

Any insight on what to do next would be greatly appreciated.
 

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