I need a few answers

Alright, a few questions

Is there a way to check the differential fluid without draiing it?

Will a empty diff cause tranny problems?

Will a bad speedo sensor create shifting problems?

My power mode light comes on at a stop but not while moving? WTF?

Does thins spoiler make my ass look big?

Smells like sulfur or fireworks or something? Kinda a stinky smell

Smoke from somewhere when in reverse or going up steep hills and flooring it?