Well my Renny preformed flawlessly, up until a very bad howling/grinding noise from the rear axle. 98,898Km's
The diff was done, luckily the power train warranty I had covered it. that would have been
about $3000.00 to repair my self. (CDN funds)

Now it rides like new......where's the mud?

how many times had you changed the fluid in the rear end and which type please

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I used 75W/90 front and 75W140 rear all synthetic (Castrol)
ATF+4 for the Transfer case and the Transmission.
And replaced the 2 filters in the Tranny.
And I did this every 30,000Km, wether it needed it or not.

And this would be about $600.00 plus at the dealership, I did
it my self for about $340.00 CDN.
Took 3 hours maybe longer if your not handy with a wrench.
And yes you have to remove the front skid, to drain
the front diff.

Hope this helped you.