i have an 87 firebird that i parted out the rearend is still in the car but i don't know if it's worth saving because i don't know what it is. the only thing i can tell you is that when you spin one wheel in one direction the other goes in the same direction, on my formula which has a stock non-posi rearend if you spin one wheel in one direction the other goes in the opposite direction. is the rearend in the parts car posi? it has drums and not discs. any info is greatly appreciated,

 

wtf if one wheel goes forward and one goes backwards thats kinda messed up? lol i have no idea what you are talking about

 

when my car is up in the air and the wheels are free if you spin one forward the other goes back

 

well my car isnt posi and it does the same thing yours does the tires spin the oppsite way, but im preaty positive that the parts rearend is posi anyone correct me if im wrong but preaty much all the time when the wheels are free and you spin one tire and the others spin in the same direction its usally posi

 

Why not just pull the cover off and find out for sure?

 

In theory, if both wheels turn the same way, then you have a posi. In reality, maybe you do, maybe you don't... pull the cover and look. Then you know for sure.

 

hah too late now, the wrecker came and picked up what was left of the carcass, too bad though

 

ya considering if it was a 3.23 posi rear end i'd have bought the guts from ya :P

Derrick

 

why would any one want to do that? you'd have to get under the car and most likely get dirty. plus you'd miss out on all the mc donalds parking lot monkey spank going on here.

 

Did 3rd gen rears without posi even come with 3.23's???

 

nobody said it was stock random

 

lol oh... well still, could third gens without posi or limited slip come with 3.23's?? I just thought this thread could answer one of my questions cause I bought a rear end out of a 3rd gen camaro that had 3 series gears, but when you spin one wheel, the other spins the opposite direction, and they told me it was a limited slip... im worried cause the rearend in my camaro right now only spins 1 tire and when its in the air, the wheels spin opposite directions when you spin one... so yea... just tryin to get an answer lol

 

it you lift the wheels off the ground, and hold onto the left one, and spin the right one around a couple times, if the left one catches, and spins the same direction, than its a limited slip, if it only spins opposite, its not. another way to tell is to just do this---->

 

well heres the thing... on my car, when you lift the wheels off the ground and hold the left one and spin the right... the left catches, but still wants to spin the opposite direction.

The rear end that I bought, when you hold the left one and spin the right, the left doesn't do anything really, it wants to spin the opposite direction but its not like it keeping the other one was spinning like it is on my car. And it goes both ways if you hold the right and spin the left.

However, on the rear end that I bought, if you spin the pinion, both wheels spin the same direction. I'm just confused as to weither or not its a limited slip or not lol

 

lol, if the left one does not catch or go the same way as the right one, its not limited slip.

if the rearend was from a regular firebird and it was stock, its not limited slip.



i got an idea, go out to your car, pull it into the street, hold down the brake and slam the gas(if its an automatic), do a burnout, then look back to see how many lines there are.(when you get the rearend in).

 

You might be on to something there.

 

There is one thing to look out for when doing the tire spin test (posi - both spin same direction, singletrack - spin opposite) to determine if a rearend is a positac. An old trick was to weld the spider gears to cause the rear to act like a posi. The bad thing with this is the lack of the clutch pack and it will cause both tires to spin at the same rate all the time. Very bad around corners when your inside tire will travel less distance in the same amount of time.

 

first off, the "tire spin vs direction" method doesn't work. The zexel and other torsional posi's will spin oposite if turn from the wheels, they only power both when shocked from the pinion/ds.
- as for a 3 series carrier being open, yes they were very comon. The v6 rears were usually 3.42 open diffs.

 

My buddies old LG4 305 firebird had a 3.23 with a limited slip in it. I think it was an 85 or 86 model. My other friend had an 83 H.O Z28 with a T5 and 3.73 gears but it had an open rear ,,, suprisingly!

 

my original rear out of the 83 z28 had 323 open rear 26 spline series 3 carrier
the rear under it know came out of a 89 firebird has 342 open rear with 28 spline axles
i took a rear out of a 84 z28 that had a series 2 carrier 308 with 26 sline axles
youre not going to know until you open her up