I am using a Sierra Diff in a DeDion configuration, and notice that most seem to be solidly mounted to the chassis. I was considering using poly bushes to isolate NVH; is this advisable or should I not bother worrying about it?

Thanks,
Shaun

I wouldnt bother to be honest.

You get that much vibration and 'driving feedback!' with such a light car with relatively hard suspension that you would not notice any difference with it mounted on polybushes.

And besides its just another item to check for wear and potentially replace in years to come.

Hi, I think most people bolt the diff solidly and that by including bushes, you will just be making work for yourself.

It's just my opinion, not the definitive answer.

What do other people think?

John

KISS, a very under used anacromym.
(keep it simple stupid)



[Edited on 1/7/06 by jollygreengiant]

Using poly bushes is an excellent idea. It's what I do in the chassis I build.

Yes, it is more work, but the difference without the gear noises reverberating through those hollow chassis tubes is worth it.

Cheers,
Syd.

My diff is solid mounted.

However what concerns me is the different expansion rates of the aluminium casing and the the steel chassis. Could this effect the fine setup clearances in the diff? Especially as it is very difficult to get a solid mounting and not stress the chassis or diff when bolting up.

Soft mounting the diff is fine but take care to understand the forces involved and ensure you design the mountings to suit.

John