Driven axles vibrations

Hi everyone,

I have found strange issue; driven axles on T-series start vibrating violently between 23-25 kph under light or medium throttle (even under full throttle, but its easier to notice under light throttle). Happens with or without trailer, any load weight. Same issue is present on D-Series (tested on D35 Crew Cab Dually RWD) between 17-18 kph, vibrations even arm ESC. The issue persists in Safe Mode.

Do you have same issue anybody? Maybe something wrong with duallies or live axles?

 

If you shift up into a higher gear, does this go away?

 

Thanks for reply

On T-Series:
I tested it in 5th 6th and 7th gear, it starts exactly at 23 kph and continues up to 26 kph, regardles of gear. If vibrations occur in corner, it can send you sideways.

On D-Series D35 Crew Cab RWD Dually:
it was auto so at 17 kph i was unable to upshift. When vibrations occur, ESC light starts flashing.

 

Hmmm.... that sounds like some sort of instability. I will have to try to see if mine does the same. It could be a drivetrain instability (brought to light by the new tire physics perhaps?)

Otherwise it could be a mod that is interfering somehow.

 

Vibrations persist in Safe Mode as well. If u want to recall the issue easy way, drive uphill (for example Utah) so you can moderate speed preciselly. It is possible even on flat, just hold 23 kph or 6-7 mph with T-Series (i tested it with default 6x4 Longhaul) and 17-18 kph or 5 mph with D-Series (I tested it with default D35 Crew Cab RWD Dually). On D-Series Flashing ESC light will occur during vibrations as well. Tested in Safe Mode.

 

Could it be possible because the wheels aren't exactly perfectly round? They are polygons, so there will be a bit of vibrating, maybe those speeds are exact for the vibrations, and they don't occur after 30kph? You can notice it while crawling at low speeds like 1 kph.. the car wobbles very slightly coz the wheels aren't exactly circles..

 

If wheel roudness would be issue it would affect all wheels IMHO. But vibrations occur only on RWD live axles (I did not notice it on multilink) under throttle. When travelling with zero throttle through those speeds, vibrations are none or less severe. This bug looks like some kind of resonance, becasue it is forcing to shake whole axles, which results in loss of traction. Wheels may not be issue tho. Vibrations were not present before v0.21 update.