Hello.
I also had this rumbling noise from the back of my 1999 5-door HRV. It
turned out to be water in the differential fluid. Honda UK replaced
the fluid and flushed out the system. The noise never returned, and my
HRV went on to do 200,000 KM.
They fixed it quickly, with no problems. My HRV was still under
warranty when this problem happened.
Hope this helps.

--- In hondahrv@yahoogroups.com, dikdayhon <no_reply@...> wrote:
>
> I've recently bought a 1999 3-door HRV from a private seller here in
> Australia. The car
> drives fine for most of the time except for a mild rattling noise when
> driving at low speeds or when stopping with the Drive gear engaged.
> There is also a shuddering noise when I make full-knob turns at low
> speeds (e.g., when making a U-Turn). I wonder if these two problems
> arose from the CVT system or from elsewhere.
>
> My local Honda dealer is the Wollongong City Motors. I've booked an
> appointment with them next Wednesday for an Transmission Fluid
> change and to have them look at the problems.
>
> About the special agreement that Honda Australia makes to
> repair/replacement of the CVT for 10 years, do I need to make known
> to the Honda dealer that I've heard about this special agreement when I
> bring the car in for an inspection? My worries are that they might
> refuse
> to repair/replace the CVT system if it is found faulty.
>
> I would really be grateful if you could advise me on how I should
> approach them (the Honda dealer) with the problems.
>