Originally Posted by TopspeedLowet

You can use as many as you can afford. Just be sure to use the bearing type and not the cheep pinned ones. The way you can tell is the cost on the good ones are about $75.00 each, Flaming river makes the ones I use. I use two 1/8" hardened roll pins on each end of the U joint to connect them to the 3/4" chrome molly tube.
Bruce