9in is definately the way to go
9in is definately the way to go I went to the track over the weekend for the first time with my cam, headers and 9in from Scott @ Driveline Solutions. I was really happy with the times I turned (best of 12.32 @114.5) which is pretty good considering my tune is still off. My car is 3800lbs with me in it and has 275 nittos on it. I was launching at 4000 and cutting 1.8x 60s. I've never been able to really launch the car on the 10 bolt the way it needed to be launched. The best part is I had no fear of my rear grenading and when I was done the rear was still as quiet as the day I put it in (which seems to be an issue with some 12 bolts). I really have to hand it to Scott (1BAD86Z28) he set my rear up perfect and the driveability is no different than the 10 bolt. I think its time to spray 
. If anybody has any questions feel free to ask.
. If anybody has any questions feel free to ask. Last edited by TPY2KWS6; Nov 21, 2005 at 11:17 AM.
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Sounds good Tom, and congrats! I've been waffling back and forth between the 9" and the 12-bolt. As it stands now, I'm pretty much set on the 12-bolt with 4.10s and some sort of posi.
I don't have a track car but I'd like to go at least once to see what kind of time I can pull with street tires. I've decided on the 12-bolt because I think it will be easier to install and make work with my car, plus I think a HD posi will be better for the type of driving I do (lots of twisties in the Northeast).
I'm curious how difficult you found the 9" to install, and if you had issues with the pinion angle? Also, can you notice a power drop with the 9" because of its weight and parasitic loss? Any issues with the torque arm or anything else you can think of?
Thanks.
I don't have a track car but I'd like to go at least once to see what kind of time I can pull with street tires. I've decided on the 12-bolt because I think it will be easier to install and make work with my car, plus I think a HD posi will be better for the type of driving I do (lots of twisties in the Northeast).
I'm curious how difficult you found the 9" to install, and if you had issues with the pinion angle? Also, can you notice a power drop with the 9" because of its weight and parasitic loss? Any issues with the torque arm or anything else you can think of?
Thanks.
Originally Posted by TPY2KWS6
I went to the track over the weekend for the first time with my cam, headers and 9in from Scott @ Driveline Solutions. I was really happy with the times I turned (best of 12.32 @114.5) which is pretty good considering my tune is still off. My car is 3800lbs with me in it and has 275 nittos on it. I was launching at 4000 and cutting 1.8x 60s. I've never been able to really launch the car on the 10 bolt the way it needed to be launched. The best part is I had no fear of my rear grenading and when I was done the rear was still as quiet as the day I put it in (which seems to be an issue with some 12 bolts). I really have to hand it to Scott (1BAD86Z28) he set my rear up perfect and the driveability is no different than the 10 bolt. I think its time to spray . If anybody has any questions feel free to ask.
. If anybody has any questions feel free to ask.
Originally Posted by Predator
Sounds good Tom, and congrats! I've been waffling back and forth between the 9" and the 12-bolt. As it stands now, I'm pretty much set on the 12-bolt with 4.10s and some sort of posi.
I don't have a track car but I'd like to go at least once to see what kind of time I can pull with street tires. I've decided on the 12-bolt because I think it will be easier to install and make work with my car, plus I think a HD posi will be better for the type of driving I do (lots of twisties in the Northeast).
I'm curious how difficult you found the 9" to install, and if you had issues with the pinion angle? Also, can you notice a power drop with the 9" because of its weight and parasitic loss? Any issues with the torque arm or anything else you can think of?
Thanks.
I don't have a track car but I'd like to go at least once to see what kind of time I can pull with street tires. I've decided on the 12-bolt because I think it will be easier to install and make work with my car, plus I think a HD posi will be better for the type of driving I do (lots of twisties in the Northeast).
I'm curious how difficult you found the 9" to install, and if you had issues with the pinion angle? Also, can you notice a power drop with the 9" because of its weight and parasitic loss? Any issues with the torque arm or anything else you can think of?
Thanks.
As far as power drop I really didnt notice a drop in performance partially becuase I went from 3.73 to 3.90s so the small increase in mechanical advantage made up for the loss in efficiency. To be honest with you there is no difference in driveability. I really cant feel a difference just driving around so I'm really pleased with it. Where the difference really lies is the ability to launch the car, its really nice to drive the car hard and not worry about breaking it. I went with a 31 spline tru trac so I was able to have a strong unit with a minimum of rotating mass. Scott was really helpful in choosing what was right for my application so it kind of took the guess work out of it.
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Originally Posted by Smartass6885
what was your best time before the 9" went in?
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Verdad Gallardo TECH Addict
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Originally Posted by TPY2KWS6
The install was straight forward. I pressed my own reluctor rings on but you could have those done if you didnt want to do it. I had no issues with pinion angle it was pretty much a plug and play.
As far as power drop I really didnt notice a drop in performance partially becuase I went from 3.73 to 3.90s so the small increase in mechanical advantage made up for the loss in efficiency. To be honest with you there is no difference in driveability. I really cant feel a difference just driving around so I'm really pleased with it. Where the difference really lies is the ability to launch the car, its really nice to drive the car hard and not worry about breaking it. I went with a 31 spline tru trac so I was able to have a strong unit with a minimum of rotating mass. Scott was really helpful in choosing what was right for my application so it kind of took the guess work out of it.
As far as power drop I really didnt notice a drop in performance partially becuase I went from 3.73 to 3.90s so the small increase in mechanical advantage made up for the loss in efficiency. To be honest with you there is no difference in driveability. I really cant feel a difference just driving around so I'm really pleased with it. Where the difference really lies is the ability to launch the car, its really nice to drive the car hard and not worry about breaking it. I went with a 31 spline tru trac so I was able to have a strong unit with a minimum of rotating mass. Scott was really helpful in choosing what was right for my application so it kind of took the guess work out of it.
I was reading up on the Detroit Truetrac and it seems like the best of both worlds, sort of like a super strong limited-slip, and a spool when needed, no clutch plates. Too bad you can't get it with a 12-bolt.Did you use reuse your stock driveshaft and did it fit okay? If you ordered a new DS, did Scott know what length you needed, or did you have to measure after installing the 9"?
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BTW Tom, I see you got 3.90s (which seems to be the perfect gear ratio), are they quiet? I've heard that they're noisy, at least in a 12-bolt.
Are you saying that you almost gained 1 sec. in the 1/4 just by changing your rearend?
Are you saying that you almost gained 1 sec. in the 1/4 just by changing your rearend?
Originally Posted by Predator
Thanks Tom, you got me leaning toward the 9" now. I was reading up on the Detroit Truetrac and it seems like the best of both worlds, sort of like a super strong limited-slip, and a spool when needed, no clutch plates. Too bad you can't get it with a 12-bolt.
Did you use reuse your stock driveshaft and did it fit okay? If you ordered a new DS, did Scott know what length you needed, or did you have to measure after installing the 9"?
I was reading up on the Detroit Truetrac and it seems like the best of both worlds, sort of like a super strong limited-slip, and a spool when needed, no clutch plates. Too bad you can't get it with a 12-bolt.Did you use reuse your stock driveshaft and did it fit okay? If you ordered a new DS, did Scott know what length you needed, or did you have to measure after installing the 9"?
Last edited by TPY2KWS6; Nov 22, 2005 at 12:09 PM.
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Sounds good Tom, and thanks. I've been wondering about the torque arm situation. I've heard that if you used an aftermarket one that there's not enough clearance. You using the stocker or aftermarket?
Originally Posted by TPY2KWS6
Nope. Tru-Trac
Good choice. Ive seen to many people in my club bitch how they broke a 12 bolt and my 9' is still rolling strong 
Originally Posted by Predator
Sounds good Tom, and thanks. I've been wondering about the torque arm situation. I've heard that if you used an aftermarket one that there's not enough clearance. You using the stocker or aftermarket?
Originally Posted by JMBLOWNWS6
HAHAHAHA You know when the tru trac locks Good choice. Ive seen to many people in my club bitch how they broke a 12 bolt and my 9' is still rolling strong
Good choice. Ive seen to many people in my club bitch how they broke a 12 bolt and my 9' is still rolling strong TECH Addict
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Tom, thanks for the replies.
It's looking like a 9" with 31 or 33 spline (not sure), 4.10s, Truetrac, maybe just stock TA, and either stock or upgraded DS (not sure). I really want a Truetrac--sounds great! Is a Truetrac the same as a Trach-Tech (as listed on another site)?
BTW, did you go with stock wheel studs (12mm) or 1/2"? Any thoughts about that?
Thanks again!
It's looking like a 9" with 31 or 33 spline (not sure), 4.10s, Truetrac, maybe just stock TA, and either stock or upgraded DS (not sure). I really want a Truetrac--sounds great! Is a Truetrac the same as a Trach-Tech (as listed on another site)?
BTW, did you go with stock wheel studs (12mm) or 1/2"? Any thoughts about that?
Thanks again!
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Originally Posted by TPY2KWS6
BTW I would reccomend doing Control Arm Relocation brakets when doing the rear. They help alot. I chose UMI but there are others that are as good.
