Vibration at 60 to 75 mph. Balance or Differential?

[STS]

Dealer will be replacing differential for what I thought was a tire balance issue. Under warranty so I'll see what happens. Anyone else experience this?

2015 Genesis Ultimate with 51K

 

[kaigoss69]

2015 5.0 does it at 60-80 mph. Good to know, I'll check with dealer next visit.

 

[Isnik0802]

Mine vibrates too let me know if it works out

 

[STS]

So, dealer replaced rear differential last week. No improvement! Today I noticed "clunking" between shift points at lower speeds, less than 30 mph.

I'm thinking this is a driveshaft issue. I emailed the dealer tonight requesting immediate help with this. I'll keep the group posted.

2015 3.8 Ultimate H-Trac
52K

 

[Andyj]

Our 2015 3.8 RWD CPO came with brand new Pirelli Cinturato P7 tires which so far are flawless with no shake or vibration at all, very smooth at 33 psi. I hope the Pirellis last, but if not Michelin Pilots are my choice for the next rubber.

The car is so solid and quiet it's scary, but it whines/whistles when lightly accelerating between 40-80 coast. Sounds like a differential or tranny and the pitch increases with light throttle, then stops completely with medium to hard throttle. I can reproduce it at will and am considering recording it for my dealer, but is it fixable? Otherwise the car is awesome!!

 

[NLJ]

Could be your driveshaft if it is a whinny sound!

 

[STS]

Problem finally resolved!

Work done since December 2018: Replace rear differential, true rear rims (out of round?), wheels balanced and 4 wheel alignment.

About 3 months and 2.5 weeks in shop but fixed!

Running smooth and true up to 100 mph.

Thanks to All

 

[Andyj]

My whine at light acceleration was just confirmed as the rear differential. Part on order.

 

[carguy75]

Seem like a few of the rear differentials are going out going by this thread.

I changed my rear differential oil at about 60k miles and it was not in good condition; the gear oil was burnt. I replaced my factory-filled gear oil with full synthetic Royal Purple 75w-90 gear oil with friction modifiers and so far so good. I am not sure what brand of gear oil Hyundai uses at the factory, but it does not seem to be a type of gear oil for long term use.

During my next oil change I will inspect and torque down my drive shaft bolts.

 

[barrie380GT]

were the rims repaired under warranty? my rims were out of round from potholes and i was on the hook. Sent them off to be rounded and powdercoated

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[STS]

Not sure if warranty covered the rim repair or whether the dealer absorbed the cost.
I was not charged.

 

[Andyj]

Differential replaced under warranty. Whistle gone. No vibrations so far and rides like a sporty limo.