Has anyone fitted thin plastic spacers between the steel plates and the aluminium body where the rear subframe mounts?

I (my wife) has some flexible plastic chopping boards in the kitchen about 1mm thick that could be cut up to make very neat spacers.

Is there a good reason not to do this to break the connection between these two argumentative metals?

^^^ Yes. I've fitted these between the plates of steel which touch directly onto the chassis on the rear subframe:

https://www.amazon.co.uk/dp/B0963W1287

They are 1mm thick, and I cut them to match the shape of the plates. Adhesive on one side, so easy to stick to the metal plates whilst re-fitting it all.

This was on the back of Haylands doing similar when we've replace our ACE hydraulics pipes that run to the rear. We also etch primed the alu chassis and dinitol'ed it also. ( The threads are in the L405 sections )

Is it worth it? 100%. It not only gives some piece of mind about separating the metals, but it also makes a noticable change to the noise levels in the car. The silicon pads must insulate a notable amount of vibration coming up through the wheels and subframe. I noticed a difference instantly, and Haylands has similar observations.

Why on earth LR didn't think to do similar at assembly is beyond me. The improvement is really that good. V8 or else ...

Here you go, worth a read....

https://www.fullfatrr.com/forum/topic67828.html Pete
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2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand Sold
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Sold
2002 L322 Vogue 4.4 V8 Epson Green (Fatty Offroader) Sold
-Click for Project Fatty off roader-

Thank-you.