what is this sensor

i dont know if you can see it real good but there is a sensor on my rear end that is unhooked and im not sure what it is for i drew and arrow and somewhat circled it

i have my bed off as well... the only thing i can think that sensor is a speed sensor. i dont know what else it could be there isn't a rear end temp gauge or a rear end oil pressure gauge so i'm assuming thats what it is.

abs??

yea that b e the abs plug

ABS speed sensor.

ok so its nothing i need to worry about then cause im taking all the abs bull off the truck anyway