Shaky feeling and wobling due to Goodyear Tyres??

Hi Amrut,

Happy to hear that you are back on track with the new GY tyres and your car rocks now !  I would suggest your to write down the tyre numbers and keep it safe in your locker . ( including the spare one ) I hope you understabnd why i asking you to do so. When ever you give your car for servicing one of the things we need to check is the tyres and the numbers are matching or not ! Sometimes seeing is not believing ,

Have a happy traction tarmac experience ok

Regards

Mathew

Hi

It's almost 2K Km with my new Goodyear Duraplus tyres. They are running good but, I am suspicious that again the whimming sound has reccuring at lower speeds. There is no visible issue with alignment. The car goes straight on straight roads (hands off the st wheel). The sound was not there for first 15days (say 700-800Km) and now started. Same thing had happened to my earlier tyres. Is there any issue with the Goodyear? OR any hidden problem in Car suspension/alignment? BTW when I replaced to new goodyear wheel balancing was done by the tyre shop and it was running OK for few days.

Amrut - refer to these responses of mine in this thread:

http://www.carwale.com/Forums/ViewThread-24703-p1.html#post239007

http://www.carwale.com/Forums/ViewThread-24703-p1.html#post239038

I don't want to sound facetious or the "I told you so" kind...but I had a feeling (don't know why) that this is what it would end up at. I still hope I'm wrong though. For starters, get the transxle oil changed - mechanic will mostly say its not needed but get it done anyways. For front-wheel drive cars usually its API GL-4 grade oil rated as 75W90 or 80W90 or something like that (check the user manual for this).

Rohit I appreciate your concern.

However I am still not sure about the cause. Tranaxle oil level is checked OK. Replacement is scheduled to 60K Km as per user manual. Anyway I will get it replaced (before schedule- No harm?)at my friend's garage soon. But the question is what bad effect it is imposing on the tyre? coz last time the goodyear tyres were rejected due to belt separation does this can happen due to faulty transaxle?

To be frank not sure how transaxle may be related. But there is something known as "torque steer" - usually found in front-wheel drive cars due to the unequal lenghts of the right and left driveshafts. Under acceleration what happens is that transfer of torque along the longer driveshaft takes time to reach that wheel - in effect one wheel has greater torque than the other and the car pulls to one side.

I imagined that dirty or low transaxle oil might mimic this condition for more than just the acceleration phase (excessive side-ways stress on the tyre can lead to premature and/or severe tyre wear) and that is why I suggested it - no harm in getting it done earlier: I had changed it twoce with a month simply because the first change was with GL-5 spec oil when the user manual calls for GL-4. Using GL-5 in place of GL-4 might be detrimental in the long run.

Ok Rohit one more important input I would like to give is when I ease on gas pedal then the whimming sound comes. No sound if there is accelaration/fast accelaration. 

Are you sure that this particular sound and the tyre wear are related? I can't imagine how anything related to easing off the gas pedal can affect tyres...let's try to walk through it...what happens when you ease off the gas pedal - all other things being untouched? Engine braking comes into play where the engine progressively cuts off fuel to the injectors as long as the RPM is greater than that indicated by the accelerator. Engine braking sounds like a hum (the whimming you refer to...?). I use engine braking all the time especially on slopes to gain some improvement in mileage but have never noticed any effect whatsoever on tyres.

Hi Rohit, slightly off-topic, is there any chance of reducing the marching noise (as termed by TASC people) by changing the transaxle oil?

"Marching noise"?? Never heard this term before... I'd be able to help better if you describe what this noise is or sounds like...

Rohit, since the problem is not pertained to this thread I have posted the details here.