Hey, i found some gears for my 9 bolt for cheap and decided to upgrade. I have 2.77's with posi and need to know if the 3.27's will go right in, they are from a 9 bolt also. Are 3.27's for 3 series carriers or 2? i think i have a 2 series right? need some help, can't pass up this deal unless the carriers are wrong

 

i have a 3.08 posi i can only swap with 3 series gear 3.08, 3.23, 3.73 etc.. you might want to make sure first..

 

i believe that is why i asked anyone else know?:lala:

 

2.77 & 3.08 are series 2 carrier
3.23,3.27,3.45,3.70,3.73,3.91 & 4.10 are series 3 gears

More 9 bolt info is at www.9bolt.com

Miles

 

The Borg Warner rear end is sometimes referred to as 'the Aussie rear end' or the 'rear end down under'. Why? Simple. The Borg Warner 9 bolt rear end was manufactured by the Holden division of GM of Australia. A few (so I'm told) aftermarket companies make gears for this rearend, but I was only able to locate one such company. This company is mentioned in the Sept. 1999 issue of GMHTP and is Reider ((734)-946-1330)) which manufactures a set of 3.73 gears for this differential. Be warned! If you have a 9 bolt with a carrier that came from the factory with 2.77 gears, you will need to replace the carrier as it will not accept gears lower than a 3 series. If your carrier is factory equipped with gears such as 3.08, 3.23, etc., then you are OK and the 3.73s will slide right in. 3.08 is not a 2 series or it would be 2.08. the 3.08 is just so rare that it's never metioned

 

I have a 3 series carrier for sale with 3:27 gears.
and shims too.

 

i know the history on the 9 bolt but was not sure about the carriers. but from what u say your saying that nething above a 3.00 is a 3 series? i have never heard that before, i believe it is everything above 3.20

how much do u want for the carrier and gears? drop me an email, i can't right now cuz i'm at school.

 

goto modifiying thirdgen f-body this site is all about 3rd generation the rearend is on ebay right now. I live in muscatine, Iowa just south of the Quad Cities. it's at $172.10 last time I checked .
Type in on ebay with ( disc brakes or posi ) to find it or #1825913029 auction number.:lala:

 

Actually the 3.08s are series 2. They are the lowest gear you can get with a series 2 carrier in the 9 bolt.

 

Oh, and are you sure that came origionally out of a 91? 89 was supposed to be the last year of the 9 bolt. There do appear to be a few that went in 90's but I have never heard of one in a 91. Do you have the car it came out of? If so check type the rpo codes in on this site on the front page where it says rpo decoder. It will tell you if that came origional in that car.

Ben

 

I got a 9 bolt in my 90 formula. No clue if they were in 91 or not.

 

The Borg Warner rear end is sometimes referred to as 'the Aussie rear end' or the 'rear end down under'. Why? Simple. The Borg Warner 9 bolt rear end was manufactured by the Holden division of GM of Australia. A few (so I'm told) aftermarket companies make gears for this rearend, but I was only able to locate one such company. This company is mentioned in the Sept. 1999 issue of GMHTP and is Reider ((734)-946-1330)) which manufactures a set of 3.73 gears for this differential. Be warned! If you have a 9 bolt with a carrier that came from the factory with 2.77 gears, you will need to replace the carrier as it will not accept gears lower than a 3 series. If your carrier is factory equipped with gears such as 3.08, 3.23, etc., then you are OK and the 3.73s will slide right in.

i just called and talk to a tech 1-734-946-1330 he said 2.77 and down was 2 series 3.08 and up is 3 series see for your self.. these guys make the gears for 9 bolt..:hail:

 

So does 88 427 Camaro (Miles). I have a 3.08 9 bolt and a 3.45 and Miles looked at pictures and told me that it (3.08 rear) was in fact a series 2. Go to 9 www.9bolt.com This is his site.

Ben

 

Actually I have a 2.77 posi rear also, so I could go compare it with the 3.08 but I am selling the 2.77 rear and the gears out of the 3.08 sunday so I am not going to break the seal on it so it leaks on the guys truck. However if he wants to check inside it to see what kind of condition it is in I guess I will compare them. Actually come to think of it When I had the 308 rear apart it read on the ring gear BW 2 3.08. I assume this means Borg Warner Series 2 3.08 ratio . I still have the pictures on my computer at home if you want I will post that one later.

Ben

 

here's the 800 number for ya 1-800-375-1330 i e-mail 9 bolt and reider so i would have something other than me typing

 

Im not saying that they didnt say that, but I would bet that they are wrong. My 308 gears said BW 2 3.08 and my 3.45s said BW 3 3.45. I am pretty sure that that is the series of carrier that those gears go on, and Miles deals with these rears all of the time and he said it is a series 2. Miles seems to really know his stuff when it comes to these rears. The only way to prove it for sure is compare a some because you have that company that says that it is and miles runs a company and he says it is series 2. Well, I would guess since this company only sells 3.70 gear(calls them 3.73s) and miles deals with pretty much any gear you could want he probably is right.

Ben

 

search for ( spo 3rd gen ) this site has some facts on 9 bolt and mods

 

Well, as far as spo thirdgen I would not go by him on the rear necisarrily. He says that the only gears from factory in a 9 bolt were 2.77, 3.23, 3.42. Well, 2.77 is right but my confidence drops from there. He then skips 3.08 which I know many people dont believe exists anyway and then goes to 3.23 which is a 10 bolt ratio where as the 9 bolt had 3.27 and does the same with 3.42 when it is actually 3.45.

Ben

 

Edit - It's ok now Thanks

Can you take a picture of the carrier without the ring gear AND/OR take measurements from the carrier bearing mounting surfaces to the ring gear mounting surfaces? Then we can determine positively what series carrier it is.

Miles

 

Whoever is selling that rear ought to get their **** straight !!!

Get 'em Miles!!

 

Well, I've already decided I'm going to get my 3.73's from Miles (in a month or so.) But is there a place that makes aftermarket replacement diff covers for 9 bolts?

Miles - The installation kit comes with the cover gasket, right?

 

We are working on a girdle for the 9 bolt which will be available late spring (ok very late spring ).

Yes, the install kit includes a cover gasket.

Miles
www.9bolt.com