I was wondering guys i have the 3.23 rear end which I think totally sucks. I was wondering do any camaros, 3rd or 4th gen, have a 3.73 or 3.72 somewhere around there. I'm looking for something posi too or is that worthless, I was just wondering cause there's something about posi that just seems cool haha.
Ok thanks
Mitch

 

I know no 4th gens have 3.73's, and I'm fairly certain 3rd gens don't either.

 

no fbodys that i know of came with 3.73s but you can put a set in yours. posi is definately worth it...especially if you go with 3.73 gears.

 

iron dukes with a stick came with 3.73's, but they were open diffs so i guess you wouldn't want them. the L69 could be had with posi and 3.73's, and also the LG4. 83-86 were the only years with those gears. no TPI or TBI ever had anything better than 3.45. the chart is here:

https://www.thirdgen.org/newdesign/tech/techdb.shtml

happy junkyarding!

 

I pulled a 3.73 disc rear from an 84 TA (non posi)...they do exist, and with the recall kit installed they stop just as well as the later disc rears.

 

l69 and 2.5 i believe both came with 3:73s. doesn't really matter if gm ever offered them or not, you can buy them from a number of sources.

 

Buy the whole set up new is 100% correct
Anything that old is gonna howl!
Even if ya swapped in the new 3:73 gear choice, that would be a plus for ya.
Real deal is to upgrade to a 4th gen rear!
I wouldn't mind trying a 3:73 rear gear in my ride, especially with the OD tranny set up.
My Firebird rear is "starting to clunk". I'm gonna start with ujoints first.
Does anyone know if the S-10 series "AXLES" fit the F Body series axle housing? They the same animals?

 

Ked, the axle is longer/wider on the f-body then on the s10. But I belive the shaft diameter is the same.

Also, f-body, s10's, caperice, buicks, and MANY other gm rides use same differential/gear design, and are swapable.

Friends 85 s10 with 2.5 has 4.10 posi in it STOCK

 

So I could actually take the 4.10 posi out of my 87 s-10 and swap it into my camaro?

 

correct

 

why worry about a posi anyway? Its not like these little 6's can smoke the hell outa the tires and go down the street if you stomp on the gas anyway. My car has a posi in it and the only time it makes a diff is in the rain. when it rains the car turns side ways when i turn instead of just the one tire spinning. Even these yokohama ultra high performance tires didnt help much.

 

I hear posi's are real good for those train tracks down by the Phily Docks, tho!
Or they pull those up by now?
For real your ride has a Posi unit in the rear.
Previous owner installed?

 

i'd hate to see the way mine would rev if it didn't have posi to spin both tires. with the stock 3.23 open rear, i could smoke the RR for about 4 or 5 seconds on the street without using the brakes. now, 3.73 posi, spins about that much still....lower gear but pullin both tires now. it'll spin well into second gear if i punch it from a dead stop....that's with an auto tranny w/ a shift kit.

 

LOL, yeah the tracks are still there.

Yeah when i got my car i was surprized when it spun both tires.. First i thought " ok just a open the tire just got stuck and spun em both" till one day i opend the rear up and took a look.

Am you have alot of work done to your motor so i can see the importance of a posi but for someone with a stock 2.8 i think better gears period would help alot never mind if its posi or open..

 

I miss my posi...

I swapped in a 3.73/posi/disc axle from a 1984 Trans Am. The tip-off is if the car's an '84 TA with a manual trans and engine code "G", it's a 99.9% chance that it's got the 3.73/posi/disc axle. (That 0.01 % is if the previous owner changed something.) Pull the cover off in the junkyard, drain the oil, count all the teeth on the gears, and make sure no teeth are missing.

Drawback #1: You'll need the 82-88 rear disc recall kit to make those discs work... even if you buy already-rebuilt calipers.

Drawback #2: The posi in '84 is not an Auburn posi, it's really an Eaton "Gov-Lock" locker. The Gov-lock self-destructs... and it blew out on me. (DAMMIT!) So I'm back on an '88 Camaro's axle.

It cost me over $600 to do that swap and have everything work. I had to rebuild the whole brake system! For $200, you can buy a 3.73 gearset. For $100, you can buy the SLP take-off posi from http://www.slponline.com . And for about $200, you can bring it to a shop so they can install the gearset & posi. That's $500 and you'll get a better setup than I had! (You need about $150 in tools to set the gears up correctly- and if you make a mistake, you'll destroy that $200 gearset almost immediately!!)

Keep in mind too, if you swap to a rear disc brake system, those rear discs add a LOT of weight- which isn't too good for our v6's to carry.

 

Hey Tom, just wanted to point out that the SLP takeout posi is only a direct bolt in for for the later rears (82-89??? rears have 26 spline axles, the later ones are 28). You can use it in an early rear, but you'll need to swap axles, too.

 

Anyone want to take a crack at explaining the difference between posi and open rears?

 

posi also called limited slip rears are rears that when one tire starts to slip and spin the other starts to spin as well because of internal clutchs etc......


Open rears are one tire friers... Your one tire spins forever without any help from the other tire.



I dont think the open vs posi thing is the most important thing with a stock 2.8 rather than the gearing in the rear.

 

Internal clutches eh? I'm gonna have to check that out.

I was thinking a set of 3.73s might be a little more fun.

 

Yes, but 6cyl92CamaroRS (the guy with the original question) has a 1992 Camaro, so he shouldn't have to worry about it at all. That's why I offered it as a suggestion!

 

I like my 3.42's...puts me right at the end of 3rd gear in the 1/4....right where I wanna be.

 

I must admit that the 3.42s work well with the T5 gear ratios and the engine's torque most of the time, just not off the line.

 

I really don't see where SLP's offering a diff for $100....

 

That's because they don't sell them anymore!
SLP ran out of the "take off" units. You can only
buy the heavy duty ones for $500 ($400 if they
are still on sale.)

This is what I have in my car now. Works mint.

 

that's what I thought...

still not a bad price for that unit. I've heard they take some serious thrashing.

 

Yes, it's a very good unit. I will be throwing about 350hp
at it. I didn't want to break a "stock" unit. I know that
350hp isn't a lot, but it's 105hp more than a 1991 Z28
with a 350.