did all borg-warner 9 bolts have Posi units or did some of them come in "peg leg" versions ???

I bought a 85 T-A and it has a 9 bolt with drum brakes, the tech page says it probably has 3.23 gears if it were factory, does the tech page hold up as far as borg-warner goes ???

 

All 9-bolts were the high performace axles with Limited Slip used with 350's and some some 5sp 305's engines.

 

According to 9bolt.com, 9-bolts were available with open carriers.

 

there are a few few amount of 9 bolts with drums and open diffs. all BW with discs had posi.....

 

Some early BW 9-Bolts such as the 3:08 were drum & open rears.
Now I am saying that all 2:77. 3:27 & 3:45 had Limited slips in them.

 

well, It looks like I am one of the lucky ones (LOL), I got a B/W with drum brakes,open rear end and 3.23 gears.

this rear is from a 85 T-A, what spline count will it have ??

I have a 9 bolt posi with 2.77 gears from an older (89 I think), will the posi unit swap into the 85 rear end and the axles match up ??

maybe by mixing the two together I can get a 3.23 posi out of it.

 

I did say early year BW 9- bolts (82-86)mostly in Firebirds. Also, if you have a 3:23 rear it is not a 9-bolt ( ratio not made by BW) only a 3:27.
I can't reply to your other questions (3:23 ???).

 

I think you got it backwards, 9bolt.com says they have 3.23 gears and not 3.27, anyways, do all 9 bolts have the same spline count. I don't see anything on 9bolt.com that says anything about spline count leading me to believe that they are all the same 28 spline count. can anyone verify this for me.

 

Look a little closer. The factory option for the BW was 3.27. Miles is offering a 3.23 as an aftermarket option.

-Schultzy

 

this is what i hat e about third gens, there is so much conflicting info out there.

now, I am the not so proud owner of a 9 bolt that has 3.27 gears and an OPEN DIFF, it is an 87 model as i pulled it from an 87 GTA, and it has the crappy early stlye disk brakes, yes a disk brake open diff 3.27 9 bolt, dont beleive me? come over and ill show ya the best boat anchor that is taking space in my garage



wait................since it is RARE?..... maybe its worth more??


any takers, its for sale?:lala:

 

Okay, I looked on my RPO codes and it says that I have a Borg and Werner 2.77. I know that I do have 9 bolts and disk brakes and my car is automatic.
Is this limited slip or a true posi. What I do know is that Every single time I have spun the tires I leave 2 patches. Also is this open diff or what. I don't really know the differance. And how rare is this?

 

the only "TRUE" posi is a spool or mini spool (only good for drag racing), everything else is some version of a limited slip dif. we all call them posi units but to be technical they are all limited slip. the 9 bolt B/W are not that rare and the 2.77 gears are great highway gears but suck for bottom end power. and open dif. (also called a "peg leg") will usually only spin one wheel.

 

90iroc
That would be a rare combination since the G-80 rpo (Limited slip)
was a required option with that 9-bolt 3:27ratio with disc brakes. Can anyone else shed some light on this subject???

Note! Posi is GM's tradename for a LIMITED SLIP rear diff .

 

I see. Thanks

 

thats what i though, it is rare, but it doesnt matter to me cause a rare open diff is still an OPEN diff, does me no good, I paid 200 for the thing sight unseen, because i was told it was something it wasnt, then i had to rebuild the calipers, and put up with an open diff till i swapped my ten bolt back in the car. but now i have a zexel, and 3.73's so it all worked out good

screw 9 blots, to much hype. yes they are strong, but parts are way to much, im going with an 8.5 rear. lotta work though......?