Here is a chart giving U joint life expectancy at different angles. Now say a joint will go 200,000 miles, even 10% of that is pretty good. Add to that the low spped of an AATV. 15 degrees each way gives you 30 degrees total. Off road truck guys will commonly run 30 degrees you will find. Depending on how you design everything to pivot will determin if you need a slip yoke or not. The Avenger I pictured earlier does not use one.

Keith.

Keith.
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