I got interested via another thread which lead me down a rabbit hole of even to the extent of pulling T cases from certain year Durangos to get the sprocket, chain and 6 planet gear set... I located a potential pull from a local junk yard and then ran across several posts on the issue with the 2low kit.
The 2low kit selector fork is essentially shaved and in 2L is flat up against the "spanner" (I think its called that?)... the bigger main fork... which appears to not work so well with the wider chain sprocket.
So I abandoned that venture and just installed the 2Low kit....