A gas engine driveshaft can be used in length to 58" ctr/ctr of the joint if the tube diameter is large enough. A 3.25" tube should be fine but nothing smaller for that length. I've built 65" tube lengths where I had 4" diameter to work with but that is rare with 1280-1310 series. 1350 series will allow more flexibility.
Last edited by 53moneypit; 01/19/2010 12:59 AM.