I am going to replace the stock suspension on my 01f350 with a coilover. Has anyone seen or heard of a coilover for the rear?

 

I've seen several done.
1 was a prototype but never made it to market.

I've built 2 and in the front I used a Full traction kit on one and my current rig is a fabtech.

If I were to do another I'd get a front axle from 2013+ with the 14" rotors ( bigger rims required to clear the calipers ) and link mounts already cast in and then use a kit from Full Traction.

Or if you have the skills, build your own.

 

Have skills but that is aligned out of my comfort factor.....thanks though

 

Full traction seems like the way to go for the front. Not sure about the rear. Kelderman makes air ride systems for the rear. You might think about that route, or you might be able to modify their kit to run a coil over instead of an air bag?