Grumbling whining rear end

Technical Area Steering & Suspension
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  1. My model of MX-5 is: __NC
  2. I’m based near: __
  3. I’m looking for technical help or recommendations on: __grumbling whining rear end

My car has developed a noise between 60/70 road speed. It’s not engine speed related

No sign of leaks from diff or gearbox.
Wheel bearings aren’t hot.

No leaks from exhaust - local garage inspected on ramp

Any other areas I should be checking?

2

Its probably the diff, NC’s have had some issues with this. A google of MX5 NC diff noise will take you there.

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Agree diff is most likely. Diff oil changes get overlooked a lot.

If it’s only apparent when the roof is up, it might be hood drain valves being jammed open. I’ve gone through troubleshooting a similar sound to work out it’s the drains on mine.

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4

How did you close the flaps?

5

I haven’t yet, I have a whole thing to do in mid-Summer. It’s not so much difficult as hugely time consuming, from what I can tell.

I’m getting this kit on order:

There are installation instructions in the description.

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6

Thanks - I’ll investigate if that fits the PRHT.