273 engine swap into a Jeep CJ5

I have the "what was once" the answer.........sorta........

Back in the day you could buy (Advance Adaptors?) an adapter that mated a Chrysler A833 4 speed to a Jeep transfer case. I still have what's left of it........used in a Toyota LC with a SB Mopar and Jeep "straight through" transfer case

The problem.......I knew 2 othter guys had these, and they all had same problem.........improper clearances for syncros.......mine eventually destroyed 3rd ? gear syncro, and the shaft was not hard enough.........the jeep transfer case main drive gear ate itself into the splines of the adapter shaft and eventually the thing would neither stay in high nor low range without "bungee cord" on the shifter

It was fun while it lasted.