Yes, I am aware of which t.case comes behind which engine in which jeep. Not my first rodeo, plus I've done a fair bit of research. Some inputs you do need to swap out, some you don't. Not really an issue, easy to do. I'm more concerned about condition and the rear output. I'd rather have an internal slip yoke. Plus I'm being overly picky as i'm not in a rush to do this job. The jeep only has 130kms on it and the 249 doesn't have any issues, yet.