How to identify a posi rearend

[wally]

hey guys, i got a question that maybe some of you guys could help me out with.

i just got an 85 GN. I was in my driveway and did a small burnout and noticed that only one wheel was turning. I lifted up the back end of the car and turned the drivers side wheel and the wheel on the passenger side was turning the opposite direction, thus making me think that i don't have a posi.

did all GN's come with a posi unit? is it possible that maybe the clutches have burned out and need replacing?

i've done my fair of junkyard diving for ford 9" rearends, those came with a tag that you could read and tell if it was a locker or not. the original rearend off my GTO that i put a 9" on, was a posi unit, but also had a metal tag on it labeling it as a posi rearned.

the rearend on my GN doesn't have any tags. is there a way to identify it as a posi unit without taking the rear cover off? perhaps some type of stamp or something?

if the clutches are worn out, i know a mechanic who knows how to rebuild posi-units, i'm just trying to save myself the hastle of opening up the rearend twice.

thanks.

 

[Sinical]

Not all GNs came with posi. Does your still have the trunk tag intact? Look for code "G80". That's the posi RPO code.

 

[wally]

thanks for the quick reply.

it doesn't have the original trunk tag. i guess i'll just assume it didn't come with a posi unit until i pull the cover off.

 

[Sinical]

It would be a safe assumption but some of the other guys may chime in with another way to tell. I'm unaware of another way though.

 

[mikestertwo]

It sounds like it is an open rear. If the wheel you are turning turns relatively easy and the opposite wheel turns in the opposite direction then you can be pretty sure it is an open rear.

 

[aminga]

A posi will usually have a metal tag on the top DS bolt that says use ltd slip lube only (or something close). Then it could have been removed as well.