I've done searches and have not been able to find anything on this topic that was much use, maybe I'm not searching right but I'm not sure. Long story short I bought an 71 Fj40 with a 454 and th350 mated to a stock land cruiser case. The case is bound up pretty well in 4 high it won't go into 2 high or 4 low, it's been driven in 4 high with the hubs unlocked for quite some time and it's not coming free from what I can tell its internal not the linkage. I can lock the hubs and have 4 high, but I can't get it into low and would like low range to wheel. I had a chat with marlin crawler and they basically said the land cruiser case won't really stand a 454 too well. So my question is, is there a transfer case I can run that will retain the stock land cruiser axles? (I pulled them open the other day and I have a limited slip rear and a Detroit locker front with I believe long fields, previous owner thought axles were stock) I know a np200 can be run but have heard they're not too good with speeds over 40, there's the dana 18 but I don't think that would hold up well, would an orion kit be enough to give the current case enough beef to stand a 454?