Too Short ain't exactly throwing Jon Gruden a vote of confidence ... telling TMZ Sports he's legit torn over the way the Raiders head coach is dismantling his favorite team.
We got the legendary Bay Area rapper leaving Sirius in NYC on Tuesday ... and he made it clear right away -- he's ain't pleased with what's going down in Oakland.
"I'm really mad about 1-5," he says as he showed off all the silver and black he wore ... "I'm pissed about that."
Short's biggest problem with the team?