Another ZF5 question

I want to do a swap from the C6 to a ZF5.  It seems to be a sure fire easy way to get overdrive, with minimal changes (crossbar moving, adding pedals, but driveshaft should be fine, right? ).  I'm however having difficulty in finding one at a reasonable price that doesn't require a core.  Most places won't take a C6 as a core.  Anyone know of any places that make new or are fine to take a C6 as a core?

You're looking for a 2wd ZF5 with the SBF bolt pattern? I know the ZF5 with SBF pattern for 4x4 is hard to find. I know in my local junkyard, I watched several 2wd ZF5 SBF pattern transmissions go to the crusher...I figured the demand for them would be pretty low tbh.

What do you plan on doing with this truck?

I want to be able to drive on the highway lol.

I'm in the process of building a truck camper for the truck, which should weigh in at no more than about 900lbs.  My plan is highway driving and camping, so nothing that's gonna beat the old girl too bad.

tons of c6's on the highway. rear gear change may be the most reasonable option. but i normally install od when i build.