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Looks like the muffler/catalytic converter is blocked. Gonna get that looked to to see if that sorts it. Cheers for all the info guys.
Appreciate it :thumbsup:

Cheers for all the replies.
Not 100% it is the diff.
I'll clarify a few things and see where that gets us.
Definitely out of 4wd.
I have owned it for the last 18months and had no river crossings...

Organic or GMO?
If they are green do they last longer? Or does over ripe ones give more lubricant?

So out for a hunt this morning and i noticed that as i hit around 3000rpm i start to get a buzz/whine from the rear. This would get worse as i accelerate up to 3500rpm to more of a high pitched...