I pulled an 8.1L engine out of the van so I had extra parts. I have had no length issues. It doesn't really seem to have larger joints visually than the XJ shaft, (i have one in my '91 crew) but in my mind it was designed to steer a 1 ton van so it must be stronger, right?I found this one that appears to be what you are talking about. It seems the isolator is on the gear box side however, is that what you have?
same as this
More Information for DORMAN 425159
www.rockauto.com
From what I can tell, a 90ish shaft from jeep is 23" long and the van is 25.75. Did you have any issues with the extra length?
It does look like the one from dorman.