I have vibration from 60-75 mph consistently.
Any thoughts and opinions appreciated. Thanks for reading.
My random thoughts:
(1) Have the tires been moved-around / swapped side-to-side or front-to-rear, willy-nilly, in the course of work? If so...
It may be your tires' original placement was opportune, and in the course of work they were (re)installed in different locations which caused vibration to become evident.
Consider having the tires checked for radial force variation. I know GM shops can (or did) have this ability on their balancers. I've had my local GM shop (Vaessen Bros, Sublette, IL) balance / check RFV for me, and they use the RFV measurements to suggest the tires' placement on the vehicle so as to minimize vibration.
(2) Is there any chance someone's removed / replaced the driveshaft in the course of work? If so...
At the rear pinion, disconnect the driveshaft and rotate it 180deg. Reinstall. Test drive for vibration change.
I had a guy do rear end work on an S10 Blazer I had (gear swap, one new axle, all new bearings). Immediately after the work I noticed a new vibration, not at low speed but higher (50+ IIRC).
After driving it like this for a few hundred miles, I got the chance to fllp the driveshaft 180deg.
The vibration went away.
Problem solved.
I swear I read about this trick in the GM manual. Well, I'm sure in the manual they say to mark the rear pinion joint before disassembly and be certain to reinstall it the same way.
So when the vibration occurred after the rear-end work, this "swap" was the first thing that popped into my mind.
(3) Check the drums' balance. Their balance likely isn't as crucial b/c their mass is close to the axle, but it's something to check. It certainly can have an effect.
How to check it? I dunno... have a guy chuck-up a drum a tire balancer and give it a spin. If it's true, I would expect it to show on the balancer's results (e.g., little or no weight is suggested to be added). If it's not true... well, adding wheel weights as suggested by a tire balancer isn't an option. One likely drills the drum's rim to balance, so I'm assuming the next step is a trip to specialty shop to balance them... or get replacements that might have better balance.
I hope you find success, regardless.
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