Will a one piece rear drive shaft out of an Isuzu work for a Nissan Hardbody? I've been told they are the same length. I'm trying to get rid of the stupid 2 piece design.

Maybe they are the same length. But the slip yoke will most likely be different and the yoke on the axle end will probably be different.

I've been told the ones off of the rodeo fit like a glove. Anybody confirm?

Go find out yourself. They are all over the junkyards. I believe you can use a driveshaft out of certain 1st gen frontiers also.

Go find out yourself. They are all over the junkyards. I believe you can use a driveshaft out of certain 1st gen frontiers also.

01-04 4x4 frontier cc short bed

01-04 4x4 frontier cc short bed

I shouldn't have to cut the cross member right?