Trans light blinking

[sparky]

A coworker of mine bought a 1999 ranger with a 4.0 and auto(don't know which trans) from what i have read on the tech library maybe 4r55e, the trans is not giving any problems but after driving it a few miles the trans light starts to blink, a constant blink no code flashing just blinking, any ideas?
I told them this is why i drive a stick and they said
Thanks for any help

 

[Bent Bolt]

Gotta get the codes pulled. Can't help you untill then.