Alright I've got a Posi rear end with Leaf I wanna put in and I currently have in the car a Limited slip with Coils...is this swappable..Is there a converter kit or do I have to drill holes...or am I just out of luck? ASAP help

 

limited slip = posi; there is no difference except the trade name

What did the other rear come out of? What kind of car are you trying to put it in?

 

The rreare end came out of an 86 camaro is what I was told when I bought it. its a 10 bolt and it is leaf spring supsension. MIne is a 84 camaro and it is 10bolt also and is coild apring suspension. I think I can make it fit with a litter fabricating drilling and welding. I was thinking of swapping out the gears and axle rods but I gotta measure the pumpkin and the axles first. I'd rather put in the posi since it has traction bars and sway bars and the extra heavy duty leafs. Has anyone ever done this kind of alteration?

As for being the same...A posi locks both tires together and turns both side equally..one may slip a little more than the other but in a limited slip one tire is the drive tire and the other tire only kicks in when the drive tire slips...if you take a basic rearened a poi when you turn one wheel the other wheel turns the same direction...in a limite dslip one wheel turns one way and the other the other way. Also with the limnite dslip you can hold one tire and the other one will still spin...you should not be abe to do this with the posi.

 

no third gen ever had leaf springs. imo the cost/trouble of modifying the car wouldnt be worth it

 

In case you didn't understand clearly the first time, I will re-state the facts. Limited slip is the same thing as posi. They are identical. "Positraction" was one of GM's trade names back in the 60s for the limited slip system they put into certain cars. "Limited slip" is the generic name for any system that uses clutches that "connect" the axles together to control the amount that an axle can "slip" from the carrier; it forces a certain minimum amount of torque to be applied to a wheel that has traction, even if the other has not traction at all, in this model of rear it's about 60 ft-lbs. There is no "kicking in", except in the Eaton Gov-Lock, which uses a little governor system of weights to apply the clutches, such that it's a normal "open" rear as long as the difference between the axle speeds is below about 150 RPM.

A rear where you can turn one wheel one way and the other the opposite way is not a "limited slip"; it's what we commonly refer to as an "open" differential. It has, literally, unlimited slip; there's nothing limiting how much one wheel can "slip" from the drive shaft.

Apart from all that, none of these cars ever came with leaf springs. The suspension in all Camaros and Firebords from 82 up is identical. They are all coil spring with a "3-link" design. If you have a leaf spring rear, it didn't come out of one of these cars, and it won't have the necessary features to allow it to bolt up to one of them.

 

I understand all this but the rear-end came out of a Camaro either it was an 86 or an 89 don't remember...It may not have originally been there but that is the wrecked car it came from so I can put it in mine. And since my axle is bent it is worth the hassel also it is a 4.11 posi.

And you are correct I did not understand what you ment because by posi=limited slip no difference but teh trade name There is a difference
limited slip vs. Posi I understand everything your saying but the Posi has heavier clutches to prevent slipping which is what sets the posi and the limited slip apart and yes it is a generic name but has become the adopted name for said rear ends. And yes there is no kicking in I understand that but in a limited slip the traction on one is lets 60 and 100 on the tires and in a posi it is 90-100. About the only way to get true true posi is like to get a frankilin quick change or something of that nature.

if you want to throw trade names that early GM was Posi later and weaker versions were Limited slip

Ford had traction lock and there was detroit locker..which I believe has a slightly different machanics behind it but same idea and function

and of couse chrysler has its sure grip

All do the same job just posi is better at it that limited slip

Again I understand what you mean but I think I kindda got my response mixed I meant that they are the same but different. Understand?

 

I understand perfectly.

Posi = limited slip

They are the same thing, one is merely a trade name and the other is a generic name.

GM discontinued using the "Positraction" brand name in the late 60s. I know, because I was around at the time.

The clutches are the same for any given model of rear end, because the product is the same, whether or not the particular trade name is applied to it.

Breakaway torque in a 7½" 10-bolt is 60 ft-lbs more or less; in a 12-bolt it's about 100 ft-lbs. Has nothing to do with the trade name applied to certain year models of the otherwise identical system, which merely has larger parts in the 12-bolt. The breakaway toque is about 75 ft-lbs in the 8½" 10-bolt.

The "Detroit locker" is something else yet again. It's a ratchet arrangement.

Anyway.... if you'll listen for a minute or 2 instead of arguing about something that isn't subject to being argued about ("The Earth is flat!!!"), you might learn something.

No 86 or 89 Camaro came from the factory with leaf springs. So if you have a leaf spring rear, it didn't come out of a 86 or 89 Camaro, or any other Camaro from 82 to 2002, because there is no such thing. It's not impossible that it might have come out of a race car that somebody has back-halved; but I doubt even that, because all of the common back-half kits that fit these cars use coil-overs, not leafs. Somebody would have had to build their own.

That's another fact that isn't subject to being argued about.

So, I'd suspect that if you saw it come out of that car, you're mis-identifying it as a leaf spring rear.

But, if you have a bent axle and all you want to do is to get a straight one into your car, then you could conceivably remove an axle and put it in your existing rear, if they're the same spline count. Or, if you'd rather have that gear and the limited slip, you could either swap the whole thing into your car, or swap the gears and carrier into your existing housing.

 

ok not trying to argue but I will say this I know I'm not mistaking it b/c it still has the leafs and everything connected to the rear-end. And while I may not be a genuis I can tell the difference between a leaf and a coil.

Yes the cluctches are the same but teh "posi" as I call it has the heaveir springs inside to lock them together better.

As for race cars the old man runs a 3rd gen race car and it has a leaf posi rear-end of course we were able to cut and do whatever b/c its stripped down. And mine is stock..alot of **** in the way.

I'm not trying to argue and I apologize for that but I am siitting here starng at the rear end figuring out just what it will take to swap it. I have you explaining the posi vs. Limited slip but I'm also trying to defend my point b.c I'm stubborn as hell, lol.

I guess my arguement is kind of like the 305 vs 350 basically the same but ones punched out a little bigger. Limited slip is like the 305 and what I consider posi is like the 350.

Basically what I consider a posi just has better traction than what I consider a limited slip. The so called posi just seems to equalze the wheel bite a little better.

Back to putting it inI was just wondering if anyone here had done it and if it was possible to just swap the gears and the axle shafts?

 

If the other rear is a 7½" 10-bolt, then the internals will swap over. Of course, since it's a leaf spring rear, we all already know it didn't come from one of these cars; so it's anybody's guess whether the axles would be the right length. I guess that would be the first thing to do; is to figure out if it's a 7½" 10-bolt, because if it's not, then nothing at all will interchange.

 

as i understand it, limite slip and positraction are different...with a posi unit both wheels are "locked in" in a straight line.... with a limited slip, when one wheel starts spinning, the other locks in... and when a limited slip rear is jacked up, one wheel will spin opposite of the other, just like he said earlier.... not trying to add fuel to the fire

 

You can lead a horse to water...

Sounds like some water is needed on this fire, actually.

Give it up. "Posi", or any of it's forms, is the same thing as limited slip.

I'd suspect the seller was a decade off with the source vehicle. Like 1976 or 1979.

 

Thats thway I understood the difference but this has shed new light on me. I do know it is a 10 bolt GM, not sure if its a 7A1/2 but I shall find out as soon as it stops sleeting out. Yeah its middle of march and its sleeting..suppose to be snowng later.

As I understand it if I can swap out the central than I should be able to swap out the axle's. So Imma see if the central will swap.

By the way I also bought my Quarterpanel 75$ for full oem panel and shipping..Oh Yeah!

Car=600$ Rearend=100$ Quarterpanel=75$ Fixing Quarterpanel=Case of Beer Getting a new paint job=Cost of Supplies and a Case of Beer.

I was thinking of putting on soem of those red carbon Camaro hood emblem and then red carbon Z28 logo's The paint job is gonna be I wa sthinking a dark Blue Ground FX and all Thred emblems shoudl give a good look. I might stay with the egg shell white that it is not sure yet.

Pic....Currently(Good Side)