What's the best rear end gear oil for our cars and how much fluid does it take to fill it?

I have a question on my 86 i have a H injector and a J injector is this correct? I ask be cause I had both repair but the J injector doesn't have same flow As the H . Is that normal or I have the wrong injector.?

Can someone tell me what the 4 wires/pins that connects to our factory fans do each? i dont have a light tester to see whats power/ground/acc etc. its the one on the passenger side! thanks

been a while since ive posted on here is there a new spoiler source out there? blakeyatwork@yahoo.com