Avantime Gearbox Slippage

Whoa, mechanical wear at that mileage? Sounds rough! I'm no expert, but are you certain it's the transfer case and not just low or degraded gear oil? Have you checked the oil level and condition? Maybe try a fluid change before condemning the gears?

I did examine the fluid and noticed significant particulate matter, indicative of mechanical wear within the transfer case. The fluid level was also slightly below the recommended mark. Could the wear be accelerated, and would a simple fluid change suffice, or are we potentially looking at more extensive damage?

Okay, particulate matter is a bad sign. If you're seeing that, yeah, a fluid change might only be a temporary band-aid. With those symptoms, it really does sound like those defective gears are the problem. Get thee to a workshop!

I will take it to the workshop. The repair cost was 330€.