gear oil leakage

is there some type of seal between the tranny and the t-case i have an
AX-15 and a np231 and when i am wheelin kinda hard or long drives its starts to leak gear oil i think its coming from between the 2 aleast i hope thats the easy answer

Each unit is sealed from the other. Not a common problem that I know of, check the oil levels in both tranny and t-case - if they are not loosing much, just top the level off occasionally and be done with it until something major happens, requiring removal.

More common would be a rear main leak at the back of the engine, might want to clean everything well, then look for the leak.
HTH, Cheropair

if its gear oil then the ax-15 is leaking out the rear seal. could be a blocked vent line.