99corvette

iTrader: (12)

ok i have a 2002 z28 auto. came factory with 3.23s. it was the 3 series. ok i bought a another rear-end, it was out of a LT1 car, so i had to change the backing plates. well when i took the cover off of the LT1 rear-end i noticed it was a 2 series, but it had 3.23s in it also (which is weird). well i had it rebuilt by someone else with motive 3.73s. i think the kit came with a 3 series gear and i had them put in a 2 series carrier..... Does this sound right? It does whine pretty loud. Will they even fit though?

01ssreda4

iTrader: (96)

The gears themselves have to stay with their corresponding posi unit (2 or 3 series). Give you an example, A 2 series auto 2.73 car ordered 2 series 4.10s from summit (thick). They turned out to have sent 3 series 4.10s (thinner). There was no way this could have worked. We had a good 3 series torsen posi in the shop, so we bolted his new gears to the torsen and swapped the whole chunk it and it set up fine. That avoided him having to send the gears back and us doing all the work over. Now he has an auto with 3 series carrier and 3 series 4.10s.

99corvette

iTrader: (12)

yeah i know, but i think that i accidentally put 3 series gears in a 2 series carrier. or is it even psychically possible?

99corvette

iTrader: (12)

just talked to texas speed because thats where i ordered the kit from, it is psychically possible, but he said that it will make a lot of noise and wont last long at all.

01ssreda4

iTrader: (96)

its physically possible but anyone who is setting up the gears would see that. You cannot shim it enough to create a decent pattern without the gears rubbing so technically they wont fit.

99corvette

iTrader: (12)

which gears will rub, my pinion gear was rubbing, it was 20 thousands to deep without any shims, but the ring gear wasnt. It had the paper test done to it. Run a 1 inch wide sheet of paper through the gears to see if it makes an impression but without cutting the paper. then you know the gears are rubbing

cambirdracing

iTrader: (4)

I could be totally wrong, but I think that GM made 2 and 3 series carriers with 3.23 gears. So they made a thin and a thick 3.23 gear. Like I said, probably wrong, but somewhere in the back of my mind I remember this from something.

01ssreda4

iTrader: (96)

that may be true but does that apply to our beloved 10 bolt?

cambirdracing

iTrader: (4)

I'm pretty sure it's only the newer 10 bolt. Maybe the late 60's 12 bolt also. Need to do more research to prove me wrong. I'm not known to know everything, haha. Just stuff that I think I remember.

99corvette

iTrader: (12)

yeah i just sent the dimensions to my installer, yeah are 3 series gears in a 2 series carrier. He set the rearend up according to the specs that came with the gears, well they were the wrong gears.... So i dont even see how it is driving. Looks like the rearend has to come back out....

99corvette

iTrader: (12)

The only thing that is confusing is that the gears that came out of it were GM 3.23s which mean it should have been a 3 series carrier...does anyone know what the dimensions for the "thick gears" are suppose to be?

99corvette

iTrader: (12)

alright i figured it out, i thought i had to 2 carriers, because i didnt know they made 2 different type 3 series. They make the torsen type which is a gear style, and a auburn type which is the clutch style. So it turns out that i have a the right gears, but he has to be re set up.

01ssreda4

iTrader: (96)

glad you got it figured out

99corvette

iTrader: (12)

yeah just gotta figure out why it is whining now.

99corvette

iTrader: (12)

So did they make 2 different types of 3 series carriers that look different? A torsen which would be a gear style and a auburn which would be a clutch style?

01ssreda4

iTrader: (96)

I believe auburn was an upgraded option on some cars. Most to my knowledge got torsen.

99corvette

iTrader: (12)

Ah ok. i was thinking that the lt1s got the auburn and the ls1 got the torsen. Because the one that came out of my 02 car was a torsen. The LT1 rearend had a auburn

01ssreda4

iTrader: (96)

Yea h i recently pulled a 94 Zs apart and it was auburn. Sorry I was refering to LS cars when I said most got torsen with auburn being optional.

99corvette

iTrader: (12)

from what ive read, the best to have is a 2 series auburn

01ssreda4

iTrader: (96)

ironically, I have a 2 series auburn for sale if you know anyone who might need it.