@deprecated_ii@Spingebill@sapphire they're not throwing out the transmission/transfer case, just the engine (and usually because they want a diesel engine instead). The 1.9 TDI is a FWD engine originally, but there's also a market for RWD transmission adapters simply because of how popular it is to swap into trucks and whatnot.
I've seen a few new Jeeps with EcoDiesels (bad engine) and the Roxor "Jeeps" are diesel as well.