need to know where 4X4 relay is to check it. 4x4 shift on the fly buttons are not working. If not relay what could it be?

 

It is the shift motor needing to be cleaned and lubed. If you think it is something else then you probably also leave the porch light on for Jimmy Hoffa. There are numerous posts here on how to do it yourself. This one has the general procedure.

http://www.glue.umd.edu/~singletn/web/pages/tcase.html