Tail Shaft Conversion Kits
High Angle CV
This drive shaft is actually a modified agricultural CV assembly. Bear in mind that for agricultural purposes, 1000 RPM is a high speed and 2000 hours would be considered an extremely long life.
This shaft is very expensive (about $1,000) and will have a lower torque rating than most stock drive shafts.
If you have a mini-monster truck that doesn’t really have to do any real 4 wheeling but need the flexibility, this may just be the solution you need.