Hey does anyone know if a '92 RS with a LO3 and a A4 with 2.73 gears still stock from the factory has a posi rear end?

 

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Wrong. If there are 10 Bolts holding the cover that just means its a 10 Bolt. And as for 12 Bolts, that just means its a 12 Bolt (Stronger Rearend). I dont even think 3rd Gens came with 12 Bolts. I believe you can tell if its Posi just by putting the *** end in the air and if you spin one tire the other tire spins too. If not, you have a Limited-Slip Rearend.

 

......sorta.

Even an open rear will generally spin both sides together, but EASILY be stopped on one side.

With Limited Slip (like posi), the other side will be harder to stop.

And yeah....121 bolts never came stock on 3rd gens. MAYBE the Firehawks did....May have just been a stronger 10 bolt.

RSs came stock with an open rear & I'm not sure that there ever was a 2.73 limited slip.

 

i guess the easiest way to find out is to do a burn out and see what tires spin......

 

thats totally incorrect i cant believe how hard it is to not insult you right now but ill be good, please study long and hard if you are serious about becomeing a mechanic....

your misinformed LSD IS POSI....same thing....posi traction is just what GM calls there LSD....

 

RPO code for Limited Slip rear is G80 and was a extra cost option on the RS. With that said, about 99 44/100 of RS models have open rear. If you want to waste your time, pull the cover and check.

 

There were tons of them. I had one of many.

igotta, you're exactly right. I would love to see more people do a search on here. Or even just a Google search for that matter. For some reason some people think that "limited slip" is an open rear end. "Posi" is turning into one of those words like "NOS" that I'm beginning to cringe every time I hear it.

Welcome to TGO. You'll learn a lot here. I knew probably less than you did just a couple of years ago. But please get your facts straight before posting. And I can't help but reply to this with

OK ... now to be productive: The absolute best way to tell if you have a LSD is to remove the diff cover and look inside your rear end. Most of the LSD's in our cars will look like this:



2nd best way - Spin Test: Jack up the rear suspension, and support it with jackstands so that both rear tires are off of the ground. Chock the front wheels and put the tranny or TC in N. Now spin one tire by hand. If the other tire spins in the opposite direction, you've got an open differential. If the tires spin in the same direction, you've got a posi.

3rd best way: Light em up and see if you leave one or two black marks

 

Where do people come up with stuff like this

I mean really, will did you get that idea?

 

The uninformed giving more people the same bad information until it becomes the so wide spread that more uniformed people think it true etc etc & etc.

 

I was only wondering because my friend said that the RS models never had POSI or LSD ends? Eventually i will chang out the rear anyway, i just wanted to know becuase hes got a 93 LX 5.0(stock) and i told him that my camaro could beat it and he laughed and replied, "RS's dont come with posi stupid". I hate ford guys.

 

I bet you don't even know were the term posi came from??

 

I'm pretty sure your friend would be right on this one. Somebody correct me if I'm wrong about the RS's coming with stock LSD. But posi isn't the reason you won't beat him. Posi doesn't hurt, but his 93 LX would smoke you hands-down stock to stock. Those cars are super-quick compared to yours. The only stock third-gen F-Body that's going to give him a run for his money is a 350 TPI. The only ones that will beat him with no questions asked are a TTA or a Firehawk.

 

Another uninformed giving incorrect info on Limited Slip rears who thinks posi is a magic word for performance.

 

Are you talking about me? If so, I think you completely misunderstood my reply. I said that the absence of a LSD is NOT the reason his RS would lose to a 93 LX Mustang. The reason is that the 93 LX is simply a quicker car than his RS, posi or not. Please be careful how you word your replies if you are going to call somebody uninformed.

Well, a LSD is a performance option and a much better alternative than an open diff. You can't argue that.

 

Now you are using the correct term. For your info the original purpose of LSD was to improve traction in poor weather conditions and was later sold as a performance option.

 

Oops ... double post

 

Have you read this entire thread? If not, here's what I've said:

The reason being, it is so often misused.

I have used LSD over and over, and now you say "now you're using the correct term" ???

And as far as "correct term" is concerned, there is absolutely nothing wrong with using "posi" when you refer to the differentials in Chevy's. Chevrolet is the one that branded their LSD's in 1956 with the name "Positraction". Since then, Positraction (often shortened to "positrac" or merely "posi") has become generic trademark for LSDs. Pontiac's name for their LSD was "Safe-T-Track". But you'd sound like an idiot if you told somebody your 3rd Gen Firebird or T/A had a "3.27 Safe-T-Track" in it. So, therefore, I personally see no harm in the word "posi" as long as it is being used correctly.

Please read entire threads before posting nonsense and calling someone uninformed.

And, since we're talking about uninformed, let's look at this little tidbit of info:

100% incorrect information posted by an uninformed person.

Here's the truth of the matter:

The original "posi" was designed In 1935 ... not for better control in bad weather, but to keep the old hard-compound tires from spinning wildly behind a car with a lot of power. Cars back then didn't have shatter-proof glass, crumple zones, SRS's or even seat belts. Dashes and interiors were littered with sharp metal objects. Obviously, safety was not a big concern. Especially not enough concern for manufacturers to consider developing and building a rear end that makes a car handle better in bad conditions.



According to Wikipedia.org:


In 1932, Ferdinand Porsche designed a Grand Prix racing car for the Auto Union company. The high power of the design caused one of the rear wheels to experience excessive wheel spin at any speed up to 100 MPH. So, in 1935, Porsche commissioned the engineering firm ZF to design an LSD which performed better.




The main advantage of a limited slip differential is shown by considering the case of a standard (or "open") differential where one wheel has no contact with the ground at all. In such a case, the contacting wheel will remain stationary, and the non-contacting wheel will rotate freely—the torque transmitted will be equal at both wheels, but will not exceed the threshold of torque needed to move the vehicle, and thus the vehicle will remain stationary. In everyday use on typical roads, such a situation is very unlikely, and so a normal differential suffices. For more demanding use, such as driving in mud, off-road, or for high-performance vehicles, such a state of affairs is undesirable, and the LSD can be employed to deal with it. By limiting the angular velocity difference between a pair of driven wheels, useful torque can be transmitted as long as there is some friction available on at least one of the wheels.


Sorry, but if you call me out on something, make sure you know what you're talking about.

Has anybody answered the original question clearly yet?

 

im jumping in here with GC, he said nothing wrong and you are the misinformed person DJ for calling him out. dont worry bout proving anything to him GC. And KUDOS to u for haveing the patience to deal with questions and responses from some of the people on here, i just dont have the patience anymore....

 

Thanks. My patience is slowly wearing thin, as well.

Talked to a friend of mine today that is also my mechanic ... he knows a good bit about 3rd gens ... and I asked him if he knew about the RS's and posi. He said he was "pretty sure" that posi could be ordered on an RS, but he doubts there were very many if any at all. But he said he wouldn't be surprised if he was wrong.

So, that takes us back to square 1.

And another thing that nobody has mentioned is the possibility that 3rdgenred's car (or any other RS for that matter) may have already had the rear end swapped at some point.

Lets not worry about this anymore. Red, go do a burnout and let us know whether you lay down one stripe or two.

 

Just one LONG LONELY tire mark.....

 

Don't worry about it too much if you're wanting to swap rears anyway.

 

Look at your RPO code, Mine is a 92 RS that came with the same L03. If the RPO tag says (GU2) it is a plain ole 2.73 with an open diff. Mine would only spin the passenger side tire and was extemely weak.

 

 

Thank you gc, I was wondering if there were any TG members close to me since I just moved out here in Feb. And this is my first third gen and first build.