flrtin1

My 85Z does not have the RPO for limited slip yet it has it,
did that come standard in the
or the
no big deal I was just curious if any one knows
Thanks

ede

should have g80 on the rpo sheet i would guess posi was standard on a z28 but not sure

flrtin1

Thats why I was curious it doesn't have G80 but it came with it , thanks ede

ChevyCamaro420

Correct, G80 is the code for limited-slip, however a good chunk of Z28's came w/o posi. If you're sure it doesn't have G80 and your also sure it has posi, i'm gonna assume that somebody owned it before you did.

flrtin1

No I factory ordered it

ChevyCamaro420

hmm that's strange... maybe posi came with the MM5 code?

I have the Z28 rpo code and i dont have posi... im confused.

RB83L69

It is not part of any package. It is its own RPO.

So if it's not on the build sheet, it didn't come with it.

Which is not the same as saying it doesn't have it.

Only way to really know for certain is to take off the cover and look. Have you changed the fluid lately? Then it needs it. While you're catching up on the overdue maintenance, make a point of looking at the carrier. Count your gear teeth while you're at it, or look for the counts stamped in the edge of the ring gear.

flrtin1

Well it isn't on The RPO and it did come with it, which is why I was asking the question. And if you spent less time being a smart a$$ and more time reading the post you would of realized that

ChevyCamaro420

Have you ever had any rear end work done on your car by somebody else?

Are all the RPO codes clearly visible or are some smudged/torn a bit?

Have you personally looked to see if it has posi?


I'm not trying to make u look like an idiot or anything by asking these questions, cuz odds are u already considered all these things... but hey, everybody overlooks things every once in a while so it couldn't hurt to ask.

flrtin1

ChevyCamaro420 I wasn’t aiming that at you I just notice that RB83L69 tends to think nobody knows what they are doing anyway no nobody but me has touched the car since I picked it up at the dealership and yes I have had the cover off. The only thing that I can think of is there was a long UAW strike in late 84 early 85 and my car was built in the middle of it. I ordered it radio delete yet it came with a AM radio and analog clock and I didn't pay for them so maybe they screwed this up also. I have the 85 dealership book that I ordered it from in front of me and it says so that’s why I asked the question.

ChevyCamaro420

hmm that's really strange. oh well, never hurts to have posi... especially when u didnt pay for it.

DJP87Z28

A Limited Slip (rpo G-80) was not standard on any 3rd Gen It was a extra cost option. ( GM did not give anything away). It was a required option on certain models but you still paid for it.

ChevyCamaro420

Even if it was a required option, wouldn't the RPO code G80 be listed?

DJP87Z28

Yes. All require ment was you could not get one without the other.
Example : G92 option with xxx ratio required the g-80 Limited slip and would be listed seperate on the rpo list and other paperwork.

flrtin1

but if you notice in 85 there was no G92 option for manual transmission for any model........not arguing just trying to figure this out!

DJP87Z28

That was a example...If rpo G80 is not listed anywhere on your paperwork you DO NOT have Limited Slip. Or pull the cover and check for yourself..

flrtin1

Ok one more time, I have limited slip the car came from the factory with it and that is a fact, it also is not listed on the RPO this is why I was asking the question

RB83L69

I don't know what sort of an answer you're fishing for, but....

Maybe you're just real lucky somehow, and the factory made a mistake in your favor.

If you've ever worked in a factory around mass production, you no doubt know that factories are tightly run and accounted for. They keep a computerized inventory of every part they use, and they check it carefully to make sure it's right; because that's how they make their money. Car companies are no exception. At the assembly plant, they pull all the various sub-assemblies including the rear end off the shelf according to the build sheet for the car, which contains the RPOs, and put it in the car. They don't install posi as such, they merely install a rear end with a specific part #, as directed by the build sheet, that was previously assembled in a different plant to the specifications of that part #. Those specs would include such things as gears & carrier, as well as brake systems and sometimes suspension details if the rear includes suspension parts on it as it is delivered to the assembly plant.

So, maybe either the Saginaw Gear plant that built the rear end screwed up and put the wrong carrier in it, or the vehicle assembly plant (Norwood or Van Nuys, whichever one of the 2 built your car) screwed up and put the wrong rear end in it. It's quite unusual, because people can get fired for their inventory coming up short.

But I'm an idiot as everyone knows, and not to be believed. I'm used to that nowadays since I have a wife and kids. They have taught me that I am without question the stupidest blob of protoplasm to splat onto the surface of this planet. They never believe a word I say until they go out and find out for themselves either.

And of course, on this board, everybody wants to believe that their car is unique and special and rare, and they don't like to be told that it's not, and that even if it is, not too many other people would get up enough enthusiasm about it to even yawn. And, lots of people post on here about how their car came with some feature or other that didn't appear until some later year; as if the space aliens got bored with their usual pastimes, and took a break from creating crop circles and Elvis sightings, and instead visited an assembly plant late one night, and sprinkled some one car with magical alien fairy dust that caused one part to mutate into something that wouldn't be mass-produced and installed in any other cars for years. They don't want to hear that somebody swapped it in there after the fact because then their car wouldn't be unique and "rare" on account of it. Not that I'm accusing you of claiming anything like that; just, that sort of stuff seems to show up around here alot.

Another possible explanation for your situation is that somebody else walked into your dealership and wanted a car real bad with whatever gear yours would have come with; and the dealer, in order to make a sale, swapped that one with your original one. Which would give you not only a chance at a posi, but also some other gear besides whatever your build sheet calls for. That's something that might be worth comparing too.

The explanation for these things is usually far more humble than the space alien deal.

Meanwhile, if you got something you didn't pay for by whatever means (as long as it was legal!), just enjoy it and accept the most likely explanation, that somebody screwed up.

"The simplest explanation that fits all the facts is usually the right one".
- Occam, ancient Greek philosopher, from the days when all inventories used manual accounting

82RECAROTA

flrtin1

RB83L69 explanation isn't to far off.

Another possible explanation for your situation is that somebody else walked into your dealership and wanted a car real bad with whatever gear yours would have come with; and the dealer, in order to make a sale, swapped that one with your original one. Which would give you not only a chance at a posi, but also some other gear besides whatever your build sheet calls for. That's something that might be worth comparing too.

Just a couple questions:
Have you ever found your build sheet?
How long did it take from when you ordered the car, to when you received it?
What engine did you have in it?
Does your RPO show WY6?

It is possible the dealer never ordered it from the factory, but either exchanged with another dealer, a simularly built car, or took one of their own dealer ordered cars and as RB83L69 said swapped in the rear. If you have the build sheet, if it has a different dealer listed on it, or the order dates do not coincide with when you ordered the car, there is your explanation. If you don't have the build sheet, look at the date on the cowl plate or door, or request a copy of the dealer invoice from the GM Archive.

flrtin1

Guys the car was the one I ordered, it took 6 months because of the strike (they had management on the line) when it came in it wouldn't start and they had to push it off the truck came in on Friday and I saw it on the truck I picked it up on Monday the RPO has 1AZ for customer ordered vehicle.Yes I found a build sheet when I took the drivers seat out last summer but I can't seem to find it right now! I was just asking a simple question obviously they messed this up at the factory and that was all I was wondering

one more thing I am not too worried about how "rare" anything is on it since its had a blower in it since 1986 lol

82RECAROTA

If you give more info at the beginning, it is easier to answer your question.

List your RPO's or show the build sheet when you find it.
What engine do you have?
When did you order it?

1AZ - Order Modification, Orders Sold