As @jamesmartin has said, most transfer cases leak from the intermediate shaft "O" ring seals, they get hard with age and in some cases the intermediate shaft has become a little slack in its fit in the alloy casing bores, these rings are only a few cents each, but unfortunately the transfer case needs removing from the gearbox to replace them.
Did you replace both seal transfer input and gearbox output seal? From memory I think theres also a tube that both seals run on, but that might just be the lt77 box? could be worn?
Mate had continuing issues with seal leakage between the boxes so last time we removed his box we filled all the tell tale slots up with rtv silicone and he did a good few thousand miles with no more leaks
Hi , thanks for reply and sorry for only reverting now , been running around . Did a bit more research and all mentioned was done 100 % already . The only trick that I can still try is to remove transfer box again , replace the already new seal with another and shorten the spring on the seal a bit so fits a bit more snug and try again .Did you replace both seal transfer input and gearbox output seal? From memory I think theres also a tube that both seals run on, but that might just be the lt77 box? could be worn?
Mate had continuing issues with seal leakage between the boxes so last time we removed his box we filled all the tell tale slots up with rtv silicone and he did a good few thousand miles with no more leaks