drive shaft help

FSM's have driveshaft lengths in them. There is a chart or two floating around on the net. It's OK, but has some errors, like that rear axle chart.

Now, it's best to measure for exactly what you need if you require a new driveshaft.

If beefing up stuff, a late ford truck van has aluminum shafts in them with 1350 u-joint IIRC. Not a bad source for a core.