I did this on a 2005 3.7L (WK). Not Griffin, some el-cheap-o Amazon radiator and a simple fan with a controller. Same as Nkmaynard, rising temps and then a trans overtemp. Since the fan was part of the shroud, it was removed with the old fan and a weird "half" shroud came with the new fan. Fortunately I hadn't ditched the old parts yet, and I ended up hacking the fan off the OEM shroud, chopping the half shroud off the new fan, and reinstalling the OEM shroud. Was probably all shroud, but I used the factory hook up vs the supplied controller after that anyway. No issues after that, that is until some useless waste of human space totaled it in a hit and run...
