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2014 Silverado 1500 rear end vibes

SpeedlabDan

SpeedlabDan

Keepin it trashy never classy
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OK so my daily atm is a 14 Silverado with sb ext cab and the aluminum 4.3.
Lovr the truck but last year I threw a set of Rancho +2" front coil overs and rear shocks spec'd for this truck. At the time I also did power's top front rotors and ceramic pad.
Since then I've had it aligned aits always had a terrible vibration after 68mph.
Last night I replaced the oe rear rotors and pads as they were about done as well. Still vibrating. I'm starting to think these adjustable Rancho shocks, even tho they are on the lightest setting are the culprit.
My bed is unloaded most days so maybe they're too heavy for this truck? I still run factory steelies and one size up Yokohama at's.

Anyone have similar issues? I'm considering going with a different rear shock next. It's not a big deal but fairly annoying.
 
I agree, check the tires first. Once they are out of balance, they will wear funny, and continue to get worse. And they may be out of round now, check the runout when you spin them. Did you spin balance them or static?

Also, you didn't raise the back at all did you? Just thinking about driveshaft u-joint angles.
 
folkenheath said:
I agree, check the tires first. Once they are out of balance, they will wear funny, and continue to get worse. And they may be out of round now, check the runout when you spin them. Did you spin balance them or static?

Also, you didn't raise the back at all did you? Just thinking about driveshaft u-joint angles.
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Funny I actually swapped my spare on the back and drove it to work on both sides with no change but I have put it on stands and put it in gear to see if the wheels looked bent but nothing I could see
 
Babaganoosh said:
How is the u joints? I had to replace mine in the Tahoe, ironically it started 1 mile after the new engine.
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I have checked the ujoints but the frequency of the vibration is closer to wheel speed like wheel hop not really fast like ds speed
 
Does it get better at higher speed than 68 or get worse?

Is it constant, or has an order of resonance where it oscillates better and worse vibrations back and forth?

I have had a set of rancho 9000 shocks that were trash not long after I owned them. The shaft felt like it was just a slider, zero damping, you could flip the shock around and the shaft would just fall in or out with zero resistance. They warrantied them for me. Since then if I am not using coilovers I get the factory replacement bilstein shocks.

However, I wouldn't think shocks by themselves should cause vibration, it would definitely keep bouncing a bit after you hit a bump. There needs to be something out of balance or out of round to excite the vibration. Is it all roads or only specific roads?
 
Those years were famous for rear axle related vibration issues. Why GM has partially gone back to building their owb axles.
 
I just went through 3 rounds of tire balancing to get rid of vibration after installing new tires. I would have the tire balance checked by a shop 1st and make sure they do a dual plane balance with clamp on weights, no stick on weights.

Did you install blocks in the rear? Another possibility is bad driveshaft angles with blocks.
 
AJMBLAZER said:
Those years were famous for rear axle related vibration issues. Why GM has partially gone back to building their owb axles.
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My company has a '14 double cab work truck Silverado with the 4.3, and we smoked the rear end at like 150,000 MI. The truck is loaded with about a thousand pounds of gear at all times though. It wasn't really a noticeable vibration but there was a loud whine that came out of the rear end before we had it fixed.
 
folkenheath said:
Does it get better at higher speed than 68 or get worse?

Is it constant, or has an order of resonance where it oscillates better and worse vibrations back and forth?

I have had a set of rancho 9000 shocks that were trash not long after I owned them. The shaft felt like it was just a slider, zero damping, you could flip the shock around and the shaft would just fall in or out with zero resistance. They warrantied them for me. Since then if I am not using coilovers I get the factory replacement bilstein shocks.

However, I wouldn't think shocks by themselves should cause vibration, it would definitely keep bouncing a bit after you hit a bump. There needs to be something out of balance or out of round to excite the vibration. Is it all roads or only specific roads?
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Not a resonance but like a hop. The shocks still dampen over bumps but I'm thinking if they are "too tight" they may be transferring the tire balance or road bump irregularities into the chassis. That's my suspicion
 
Is it coming from the back, in the seat, or you feel it in the steering wheel?

From the back I'd take off your shocks and inspect them and compress them to test, and also check your leaf spring mounts, bushings, u-joints, pinion, etc.

If in the steering wheel then you need to be checking your front steering and suspension components...

Other than that you may have to eliminate more stuff one part at a time.
 
folkenheath said:
Is it coming from the back, in the seat, or you feel it in the steering wheel?

From the back I'd take off your shocks and inspect them and compress them to test, and also check your leaf spring mounts, bushings, u-joints, pinion, etc.

If in the steering wheel then you need to be checking your front steering and suspension components...

Other than that you may have to eliminate more stuff one part at a time.
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It's definitely in the seat, I was pondering the idea of the fact that I took the rake out and now the truck sits Level that maybe the Castor is causing some of it? That's why I had it aligned again but it made no change.
 
Babaganoosh said:
What load range? Doubt this is the issue but worth a try. I know on my truck I had to run 30 for it to not beam on the highway. Now with the new tires being load range E I'm thinking I will have to drop even lower.
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Not exactly sure the range but they are light duty
 
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