check transmission light flashing

I own 1994 Honda passport automatic 4x4, when start truck the light flashing. transmission have been rebuilt by shop. what other problems could be going on. I appreciate some assistance with the truck. thanks.

There should be a couple of pins you can jump on the trans diagnostic connector which should make the light flash a pattern that is an error code.
I don't know where it is or which pins on your truck, but a bit of Googling should get you that info.Then look up the error code and see what causes it.