On my 86 iroc-z tpi 305 how can i tell if the rear end is positive traction or not

 

Check your RPO codes located on the underside of your center console lid. RPO G80 is the code for a Limited Slip rear (not positive traction).

 

Jack up the car and if there is no tag on the diff cover saying it is spin a wheel. The other wheel will spin in the same direction.
Positraction is GM's brand name for limited slip.

 

I cant find the RPO codes, where again are these located? The're noton my center console lid.

 

So if i jack it up and i spin one wheel and the other spins the same direction then i have posi?

 

The only sure way is to take the cover off and look. You will have a carrier that looks like the picture. If not , you DO not have a Limited Slip rear (note correct term "not Posi").

[IMG]local://upfiles/2696/9836C002788F43138D499449413647B5.jpg[/IMG]

 

easiest way to tell is jack up both rear wheels and try to spin them (with the brake off). it should be a posi. also, the codes wont be on the lide, but on the passenger side of the console (thats where mine is)

 

No need to take the cover off. If its a LSD it will do its job and spin both wheels in the same direction.

 

What passenger side of the console? Im not seeing it.