Re: T19 inna Jeep?
I assume that you want to put this swap in your 72 CJ5. Unless you have access to a 1980 Scout II D300 and the output shaft gear, which is very rare, you will need an adaptor to bolt up the "round" D300. This will reduce a very short rear driveline. If you have any lift at all on the jeep vibrations may very well be a problem.
Only 36000 Scout II were built in 1980 and that was the end of the line for Scout production forever. The previous years had D20 x-cases. Mabe a Teralow kit for the D20?