Looks like my gear box is taking a dump. Been checking the threads on the Durango upgrade but I'm only on 31's and I just want the steering to be tight. In one of the threads i found this link

http://www.carsteering.com/

They have 3 boxes for XJ standard, High Performance and quick ratio. I gave them a call and got a good feel. Anybody have any experience. I like the quick ratio box.

 

My guess is that the quick ratio is just a ZJ steering box.
I've used one in a longbed Comanche. It's okay.