Of course if the old D2 V8 doesn't do it for you, you can invest $500K in one of these

https://www.bloomberg.com/news/artic...s-priciest-suv

 

I"m still on my original shaft, I just check it every few months for wear. Mine has a grease fitting on the front u-joint near the f.diff. It also has a removable plug for the slide on it that I remove and grease once a year.