Have my transfer box mounts deteriorated too much?

There was always quite a lot of white stuff around the bushes of the transfer box mounts since I bought my Jimny (2015). Some of the plates which sandwich the rubber even looked deformed a bit. Today I took the box out to install a push fit breather and give some cosmetic TLC for the casing. I tought if I undo to top nut on the bushings I will have a good chance to slide the box foreward. Soaked them in WD40 but no joy...there was no issue regarding the bottom nuts though so I ended up taking them out in one step together with the box. Then I had to attack the top nuts with an impact gun in order to brake them free. Here is the result...

Seemingly a lot of white stuff remained on the top plates instead on the brackets. The car get really abused only in August annually. Repairing on the fly is not an option whilst it's out in the wild. Maybe time has come to get new bushings and brackets? If so any recommendation?

The white stuff is the residue of galvanic corrosion between the aluminium frame and the steel bolt it isn't the end of the world but can be eliminated with an isolating compound. Look more at the state of the rubber if that is good and not perished or split you should be ok for a while yet.

What's the isolating compound? A chemical stuff or just a non conductive object like plastic sheet?

Its alloy rust! :laugh:

If you are only using it occasionally, but heavily, I would suggest this bracket is likely to fail on you at some point. They are known to snap fairly easily.

Jimnybits and various others produce aftermarket HD brackets for standard transfer boxes which are powder coated steel instead of the alloy and much stronger.

I prefer to run the factory genuine rubber bushes and carry a couple of spares rather than use the HD bolt-through option as that transfers a lot of noise into the car. Bigjimny shop sells the standard bushes

The isolating stuff is a chemical goo. It's readily available on the internet.

So if I understand how it works then the alloy will rust first instead of steel like sacrificial metal on boats?
I certainly need to attach a magnesium piece to my transfer guard and constantly keep it submerged in water to protect against rust. The worst protection I can imagine is power coating on bare metal. 3 years old guard should not look like this. Fuel tank guard looked bad as well.