There is a 9 bolt posi under an IrocZ at the junkyard right now. It has disc breaks. The cover was pulled and on the gears it had 2.77 stamped on them. So i am pretty sure thats the ratio. Anyway, they said they would take 250 bucks for it. I am going to try to get it for 200. Does that sound like a decent price? I still have to buy some 4.10 gears and install them.

 

4.10's won't fit that carrier. How are you going to handle that?

 

What gears will fit that carrier? Will i need something like 3.73 or what? What do you mean by how am i going to handle it?

 

you can get 3:73s for them....more pricey for them than a 10 bolt but a tougher rear end........so i would say you can handle that

 

2 series carrier and 3 series gears will not work on that 9-bolt rear.

 

man,,,,how did i miss the ratio....3:23 and up you can put nice gears on....a lot of auto tpi 305s had 3:27s, we just took one out of an 87 bird 305 5 speed and it has 3:45s....so i would look around for something like that...

 

you can get 4.10 gears for the 9 bolt but its not worth it. I looked into it b4 i put the chrysler 8 3/4 in my car . I mean they make em , very limited but i dont see why it would be worth it , maybe to make a totally appearing stock car , i dunno.

 

Whatever lower gears he was thinking about cannot be used with 2:77 9-bolt he was looking at. End of story.

 

I picked up a 9 bolt with 3.27s for 100 bucks from a guy off the board in MI. I dont think I would pay 200 for that rearend unless you find something with 3.27s or better.

 

I finished putting my 9 bolt rear end on my camaro yesturday, (3.45) feels so much better, brakes better ( DISC), handels better too. you should look too see in 9 bolts .

 

I just bought a 9 bolt (3.23 posi) for $100. putting it in right now, but i need to know if my stock brakes from a 91 firebird will switch right over onto that rear end?

 

They should, as long as the diff was 89 or newer. If it wasn't just swap the brackets over and go.

I think that the 9-bolt is a way better diff than the 10 bolt. I broke 2 10 bolts, both posi, both 3.08. I have yet to hurt my 9-bolt. I thought I did, but it turned out to be a brake problem. If you want deep gears, you'd better find a 3.27 or better. I think that Randy's sells 4.10's and 3.73's for the 9 bolt.

 

no its not worth it. i got my 3.27 9 bolt for 200. if you want, ill sell you my 2.77 9 bolt for 250

 

If you bought a 3:23 ratio I would check to make sure it is a 9-bolt a 3:27 is the correct ratio. You need to know what you have first. And No, 10-bolt brakes will not work with a 9-bolt, but again it depends on what you have.

 

I dunno I still have the 9 bolt 3.27 sitting behind the shop I took from my T5 doner car. I wonder if my 10 V6 3.42 bolt $100, $400 powertrax would outlast that posi disk 9 bolt. Sure seems to stop just fine and has held for 3 years of abnormal abuse. I never had a chick come over and say uhhahhh rear disk brakes.

 

yeah your right it is a 3.27 rear end not a 3.23 sorry. How about the 98-02 LT1 disc brakes will they bolt right up to a 9 bolt?

 

When I was stationed in San Diego, the bone yards were full of 9-bolts. I got a 3.70 for $60 at a half-off day. Brought it all the way back to San Antonio, where the bone yards here want $500 bones for 'em. Just plain crazy.

Jim.

 

Just wanted to jump in here for a second, so what you're saying is to upgrade to 3.73 or 4.10 gears you need to have a 3.27 rear or 3.45.

So the 9 bolt with the 2.77 is useless and not upgradeable as the others?

 

Your statement is correct. Unless you can get a new carrier.