commdore problem

[adam dia]

Hi guys im new to the site and i have a question if anyone can help please. I have a 2005 holden commodore aclaim wagon auto when i travel up to 80 or 90 i get a very bad shutter like grinding noise i have taken it to two motor mechanics and they are not sure what it is and they have never heard that before does anybody have an idea

[scvs6]

How many kilometers has the car done?

[DevilDRake]

Grinding noise..? If that's exactly how it is then I'm not sure, but if it's similar it could be your wheel bearings, the shudder could be that and/or wheel alignment + balancing. I'm just taking a crack, but wheel bearing humm then they get pretty loud as they're about to let go.

[scvs6]

Wheel bearings is a possibility. But I was thinking more along the lines of tyres. A VZ wagon came to work because of similar problems. It had really cheap tyres that were about half worn, and the road noise was really bad. Sounded like a grinding noise, but there wasn't a shudder. Thats why it probably could be the wheel bearings.

[Pickle']

Im gunna agree with DDR, don't know about grinding. but i reckon wheel bearing.

Also i am unsure about the mechanics your going to.

[adam dia]

Thanks for the info guys it might a wheel bearing what about the torque converter would it make noises like that

[Munz]

if there's no oil the trans might make those noises

[DevilDRake]

^ as that was said, 80-90kph is when it probably hits 4th gear.. Might need that checked too.

[m62vpute]

Check tailshaft uni's, rubbers and bolts, this can cause a shudder at them speeds esp if 1 of the bolts has came loose. Not sure about the grinding noise tho