How much stronger are the 9 bolt rears?
10-19-2003, 09:07 PM
#1
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How much stronger are the 9 bolt rears?
A stroke of luck....sort of 
I got a posi rear out of a trans am from a guy a while ago, cause mine wasnt posi. He had told me that it had 3.55's in it, and that he put them in. I didnt, really care caue it was posi/disk which mine wasnt, and I was getting it for free
Anyway its just been sitting around my uncles garage for about 5 months. But I was over there today helping out a friend, and decided to pull it out and count the splines to see what gear ratio it was.
To my suprise, its not a 10 bolt, its a Borg Warner 9 bolt! How much stronger are these than the 10s? I know it wont stand up to my engine im putting together anyway, but I bet it would last longer than my 10 would. I was planning on anihilating my stockish rear then putting together a 9" for Christine. ANybody wanna take bets on how many 4000 RPM trans brake drops the rear will take
Anyway, when I took the cover off, the gears do look brand new. I was gonna look tommorow for some insignia maybe they are Richmond gears or something.
If anybody wants it, I'll just sell it rather than killing it. How much are they worth and is anybody looking for one?
My MAIN Question
By my count (maybe slightly off) The Pinion had 11 teeth and the ring had 38 teeth. How do I compute the gear ratio from that?
I got a posi rear out of a trans am from a guy a while ago, cause mine wasnt posi. He had told me that it had 3.55's in it, and that he put them in. I didnt, really care caue it was posi/disk which mine wasnt, and I was getting it for free
Anyway its just been sitting around my uncles garage for about 5 months. But I was over there today helping out a friend, and decided to pull it out and count the splines to see what gear ratio it was.
To my suprise, its not a 10 bolt, its a Borg Warner 9 bolt! How much stronger are these than the 10s? I know it wont stand up to my engine im putting together anyway, but I bet it would last longer than my 10 would. I was planning on anihilating my stockish rear then putting together a 9" for Christine. ANybody wanna take bets on how many 4000 RPM trans brake drops the rear will take
Anyway, when I took the cover off, the gears do look brand new. I was gonna look tommorow for some insignia maybe they are Richmond gears or something.
If anybody wants it, I'll just sell it rather than killing it. How much are they worth and is anybody looking for one?
My MAIN Question
By my count (maybe slightly off) The Pinion had 11 teeth and the ring had 38 teeth. How do I compute the gear ratio from that?
10-19-2003, 09:21 PM
#3
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Originally posted by RobsWS6
Much stronger. When you get into the 1.4x launches, they don't last long. Mine is fine so far with 1.6x short times.
As for the gears, those are 3.45. Divide 38 by 11.
Much stronger. When you get into the 1.4x launches, they don't last long. Mine is fine so far with 1.6x short times.
As for the gears, those are 3.45. Divide 38 by 11.
And I think its more likely that i missed a spline, and the ring is 39 teeth. Which come out to like 3.545. Or 3.55 which is what the guy said he put in it.
Anyone know where a logo would be on the gears so I could see if they are a name brand?
10-20-2003, 05:14 AM
#4
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I doubt its a 3.55 as I don't think they made a gear set like that. With the 3 series posi, you can get 3.23, 3.27, 3.45, 3.70, 3.73, 3.91 & 4.10. The only ones available over here were the 3.27, 3.45, and 3.70.
More info can be found at http://www.9bolt.com
How fast are you planning on going?
More info can be found at http://www.9bolt.com
How fast are you planning on going?
10-20-2003, 11:40 AM
#5
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Originally posted by RobsWS6
I doubt its a 3.55 as I don't think they made a gear set like that. With the 3 series posi, you can get 3.23, 3.27, 3.45, 3.70, 3.73, 3.91 & 4.10. The only ones available over here were the 3.27, 3.45, and 3.70.
More info can be found at http://www.9bolt.com
How fast are you planning on going?
I doubt its a 3.55 as I don't think they made a gear set like that. With the 3 series posi, you can get 3.23, 3.27, 3.45, 3.70, 3.73, 3.91 & 4.10. The only ones available over here were the 3.27, 3.45, and 3.70.
More info can be found at http://www.9bolt.com
How fast are you planning on going?
10-20-2003, 07:16 PM
#6
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I'm lookin to get a new rearend for my car b/c the one I got isn't posi so I want to get one with 3.42s or so for my car. How much you lookin to get for it? and where you at? How much would shipping be?
10-20-2003, 07:25 PM
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I dont know, I dont know what they are worth. Thats one of the questions i asked. And Im not sure yet but I think it may have brand new gears in it. THe guy I got it from told me the car it was in he bought just a rolling chassis. He started with the rear end cause the car didnt have a motor or tranny yet. Then a nice fox body fell into this lap so he was junking the T/A.
Im in FL, but I gotta tell your not first in line, to my suprise several people have already expressed interest in it. Il write your name down though.
Although Im not sure i wanna let it go yet. I fI can get a ration I want for it, somewhere in the high 4.x's I think I may keep it. I dont think it will last forever, but with a good ring and pinion set I think it may last a summer or so behind my engine. Which would give me enough time to save up for a moser rear.
Can someone tell me what a complete 9 bolt 3.45 rear with brake assembly, and everything is worth?
And Im now sure they are 3.45s, there was a little tag behind one of the bolts that I took off and cleaned today and it said the ratio was 3.45.
Im in FL, but I gotta tell your not first in line, to my suprise several people have already expressed interest in it. Il write your name down though.
Although Im not sure i wanna let it go yet. I fI can get a ration I want for it, somewhere in the high 4.x's I think I may keep it. I dont think it will last forever, but with a good ring and pinion set I think it may last a summer or so behind my engine. Which would give me enough time to save up for a moser rear.
Can someone tell me what a complete 9 bolt 3.45 rear with brake assembly, and everything is worth?
And Im now sure they are 3.45s, there was a little tag behind one of the bolts that I took off and cleaned today and it said the ratio was 3.45.
10-22-2003, 05:13 PM
#8
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The lowest ratio available in new gears is a 4.10 and a 4.11 in used ratios. All the info you need is at www.diffsolutions.com
Miles
Miles
10-22-2003, 07:51 PM
#9
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Originally posted by 88 427 Camaro
The lowest ratio available in new gears is a 4.10 and a 4.11 in used ratios. All the info you need is at www.diffsolutions.com
Miles
The lowest ratio available in new gears is a 4.10 and a 4.11 in used ratios. All the info you need is at www.diffsolutions.com
Miles
I want a 4.56. I e-mailed a couple of other companies but the couple of companys that I got refered to didnt carry over a 4.11.
10-22-2003, 08:27 PM
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Darth: I've seen them go from $100 all the way to 500. Do you know if it's got Iron Calipers or Aluminum ones (PBR) and 11.65" Rotors? The latter will go for much more.
If you need deeper gears than 4.11's geuss 9" or 12 bolt is your route. Also, on a side note, you say you want single digits, any idea of the motor you'll be using? And shot or N20? Just out of curiousity.
-Rippin
If you need deeper gears than 4.11's geuss 9" or 12 bolt is your route. Also, on a side note, you say you want single digits, any idea of the motor you'll be using? And shot or N20? Just out of curiousity.
-Rippin
10-22-2003, 08:51 PM
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Originally posted by Rippin92RS
Darth: I've seen them go from $100 all the way to 500. Do you know if it's got Iron Calipers or Aluminum ones (PBR) and 11.65" Rotors? The latter will go for much more.
If you need deeper gears than 4.11's geuss 9" or 12 bolt is your route. Also, on a side note, you say you want single digits, any idea of the motor you'll be using? And shot or N20? Just out of curiousity.
-Rippin
Darth: I've seen them go from $100 all the way to 500. Do you know if it's got Iron Calipers or Aluminum ones (PBR) and 11.65" Rotors? The latter will go for much more.
If you need deeper gears than 4.11's geuss 9" or 12 bolt is your route. Also, on a side note, you say you want single digits, any idea of the motor you'll be using? And shot or N20? Just out of curiousity.
-Rippin
As for the motor Im using. 400 block with 4.00 crank, making it a 434 ci. Looking at either the WP MoTown 220 heads or the Dart Pro 1's. Eagle 6" Hbeam rods. Ross Pistons putting me around 13:1 compression. Weiand Team G intake with around a 1000cfm Dominator. To give a rough outline. Not to mention all the little peices Ive been adding lately (mostly cause I havent had the $ to buy the big pieces recently
) Like my Holley Race pump, and Mallory AFPR. Tranny I'm torn between a TH-400 and a glide. But as you can tell by my sig Im leaning towards the glide because of weight and parasitic power loss reasons.
Suspension 90:10 ratio Drag shocks under the front. And the Hotchkis rear suspension package for the back. And I got my new Summit today. They started selling a new companys parts that has ladder bars for an awesome price!
Ive already done alot of weight reduction, Id like to get it well under 3000 lbs without the driver. From other set-ups Ive studied I should be able to see mid 10s without a problem on slicks. And I want to use around a 125-150 No2 shot to try for single digits. With an OEM 400 block you cant run much nitrous since their walls are thin from teh extra bore added.
And how do I tell if I have the aluminum calipers?
10-22-2003, 09:10 PM
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I always thought the PowerGlide was a 2-speed which would lean me to the TH-400? Hm.
About the aluminum calpiers: I really can't tell you. Do you know what year the rear is? I think it was only 1989+ they had the Aluminum stuff. Also measure the rotors, I don't think the Iron Caliper ones had 11.65".
-Rippin
About the aluminum calpiers: I really can't tell you. Do you know what year the rear is? I think it was only 1989+ they had the Aluminum stuff. Also measure the rotors, I don't think the Iron Caliper ones had 11.65".
-Rippin
10-23-2003, 02:03 AM
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Originally posted by Rippin92RS
I always thought the PowerGlide was a 2-speed which would lean me to the TH-400? Hm.
About the aluminum calpiers: I really can't tell you. Do you know what year the rear is? I think it was only 1989+ they had the Aluminum stuff. Also measure the rotors, I don't think the Iron Caliper ones had 11.65".
-Rippin
I always thought the PowerGlide was a 2-speed which would lean me to the TH-400? Hm.
About the aluminum calpiers: I really can't tell you. Do you know what year the rear is? I think it was only 1989+ they had the Aluminum stuff. Also measure the rotors, I don't think the Iron Caliper ones had 11.65".
-Rippin
And Ill run some numbers but I dont think its 89+
