View Poll Results: Which one for Auto-X/Street use?
Posi
12
100.00%
soft-locker
0
0%
hard-locker
0
0%
spool (remember, I'm driving this on the street!)
0
0%
Voters: 12. You may not vote on this poll
Which rear end?
03-05-2007, 10:07 AM
#1
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Which rear end? Currently I'm putting down about 375rwhp and 350 ftlb. I'm going to be upgrading to a fast 90/90 set up with ported ls6 heads and a new cam soon. I'm hoping to be around 400-425rwhp and around 375 ft lb. With the power I have now and definately when I upgrade, I'm going to need a new rear end since I've got the m6.
I'm going to be going with the 9" since I will be drag racing it (no more than 5 or 6 times a year).
What is the best auto-x/street use unit. Posi, soft-locker, hard-locker, spool(yeah, I know this one's out)?
I want something that's going to give me optimum control while racing, but I love to street my car.
What do you have and what are your experiences? Would you go the same route if you were doing it again or not?
I'm going to be going with the 9" since I will be drag racing it (no more than 5 or 6 times a year).
What is the best auto-x/street use unit. Posi, soft-locker, hard-locker, spool(yeah, I know this one's out)?
I want something that's going to give me optimum control while racing, but I love to street my car.
What do you have and what are your experiences? Would you go the same route if you were doing it again or not?
03-05-2007, 01:50 PM
#3
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mitch; he's getting a 9" axle. Does that "Gold Trac", or whatever their name is, company still make a road race high bias Torsen type diff for the 9s?? (I know it was MUCHO GRANDE $$$$$ though! 
)
Or am I completely wrong and Torsen DOES make a T2R for the 9s???
)Or am I completely wrong and Torsen DOES make a T2R for the 9s???
03-05-2007, 02:06 PM
#5
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I am looking at a 12 bolt soon b/c I am building a 402 with (hopefully) 525rwhp + 500 rwtq. I intend to use it mainly as a street car, so I am going to get a posi for street manners.
03-05-2007, 02:45 PM
#6
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I've had another guy bring up that he doesn't know if there is a torsen unit for the 9". Anybody know for sure??? And is it Torsen or Torsien. Driveline-solutions has torsien listed as an option with their 9"s so I'm a little confused now.
J's, do you think the 12 bolt will hold up to the much torque??? I'm not going to be drag racing much, but I'm a little uneasy about taking a risk.
J's, do you think the 12 bolt will hold up to the much torque??? I'm not going to be drag racing much, but I'm a little uneasy about taking a risk.
03-05-2007, 03:09 PM
#7
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Originally Posted by mitchntx
Torsen T2R ... hands down.
An HD Auburn is probably a little better initially, but wears out really fast when loading the diff while turning.
The Torsen works well and lasts
An HD Auburn is probably a little better initially, but wears out really fast when loading the diff while turning.
The Torsen works well and lasts
Listen to Mitch! Unfortunately No TR2 for the 12 bolt or 9". If you are going with either of those the closest thing to a TR2 is a Detroit True Track but it still lacks bias by comparison. The only thing comparable to the TR2 is The Auburn Racer's Differential unfortunately it is an Offroad only piece you can read about it here. Also Note that is only available for stock 10 bolts or 8.8" ford housings which again leave you little option if going to a 9" or 12 bolt.
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03-05-2007, 03:22 PM
#8
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So it almost seems like fate if forcing me to go with a 12 bolt. I thought the true track is a soft locker. Honestly, the lockers kinda make my brown eye pucker up while cornering in the rain.
For the people with 9", what posi are you using???
For the people with 9", what posi are you using???
03-05-2007, 03:32 PM
#9
There are options for the 9", lots of them.... A T2R is not among them, but a "normal" Torsen is. 9" is the best choice for having your pick of LSD's.
Happy to discuss options with you.
Happy to discuss options with you.
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03-05-2007, 05:29 PM
#11
Happy to, but can't do it by e-mail.
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03-06-2007, 10:54 AM
#14
That'd be fine. If I can't answer, please leave me a message. 
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03-06-2007, 06:38 PM
#15
I do both drag racing and autocross with my car. I have to admitt it is a comprimise to both events. I use a Moser 12 bolt with an Eaton HD posi.
My car makes 510 rwhp NA and 640rwhp with 775 rwtq on a 150 shot of spray.
Last year I exploded the spider gears NA at an autocross that had a high speed slalom and the 4.10 gears exploded at a drag TnT. That being said I have now upgraded the spider gears and put a solid cruch collar on the pinion to try to hold it together. BTW I also found out that I had twisted my Moser 33 spline axles with my 1.48 60fts on a 3880lb race weight.
With your hp this setup should work but I will tell you at an autocross it does not turn in as well as I would like it too. You have to wait for the posi to release and it is an abrupt release. If I had to do it over I would consider a TruTrac, it is similar to a Torsen and supposed to be much smoother.
That is about all I can tell you though from my experience.
My car makes 510 rwhp NA and 640rwhp with 775 rwtq on a 150 shot of spray.
Last year I exploded the spider gears NA at an autocross that had a high speed slalom and the 4.10 gears exploded at a drag TnT. That being said I have now upgraded the spider gears and put a solid cruch collar on the pinion to try to hold it together. BTW I also found out that I had twisted my Moser 33 spline axles with my 1.48 60fts on a 3880lb race weight.
With your hp this setup should work but I will tell you at an autocross it does not turn in as well as I would like it too. You have to wait for the posi to release and it is an abrupt release. If I had to do it over I would consider a TruTrac, it is similar to a Torsen and supposed to be much smoother.
That is about all I can tell you though from my experience.
03-08-2007, 09:39 AM
#16
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Originally Posted by RAMPANT
I do both drag racing and autocross with my car. I have to admitt it is a comprimise to both events. I use a Moser 12 bolt with an Eaton HD posi.
My car makes 510 rwhp NA and 640rwhp with 775 rwtq on a 150 shot of spray.
Last year I exploded the spider gears NA at an autocross that had a high speed slalom and the 4.10 gears exploded at a drag TnT. That being said I have now upgraded the spider gears and put a solid cruch collar on the pinion to try to hold it together. BTW I also found out that I had twisted my Moser 33 spline axles with my 1.48 60fts on a 3880lb race weight.
With your hp this setup should work but I will tell you at an autocross it does not turn in as well as I would like it too. You have to wait for the posi to release and it is an abrupt release. If I had to do it over I would consider a TruTrac, it is similar to a Torsen and supposed to be much smoother.
That is about all I can tell you though from my experience.
My car makes 510 rwhp NA and 640rwhp with 775 rwtq on a 150 shot of spray.
Last year I exploded the spider gears NA at an autocross that had a high speed slalom and the 4.10 gears exploded at a drag TnT. That being said I have now upgraded the spider gears and put a solid cruch collar on the pinion to try to hold it together. BTW I also found out that I had twisted my Moser 33 spline axles with my 1.48 60fts on a 3880lb race weight.
With your hp this setup should work but I will tell you at an autocross it does not turn in as well as I would like it too. You have to wait for the posi to release and it is an abrupt release. If I had to do it over I would consider a TruTrac, it is similar to a Torsen and supposed to be much smoother.
That is about all I can tell you though from my experience.
You've got a lot more power than I plan to have with this engine. I'm hoping for around 425whp and 400ftlb. My race weight's going to be similar to your's, but I'm not going to have the 400 extra mind bending ft lb's of torque. Considering this, I might be fine going with a 12 bolt and getting the torsen t2r. I've always been one to try and over build the first time so I don't have to do it again though. Also, I thought the TruTrac was a soft locker and not a posi. I really don't want to get a diff that's not predicible. They always have a long slalom course set up on the course too. I think I might need to start a 12bolt and 9" poll. The 12 bolts seem to have better diff options but the 9"s are still stronger. ugh...
Thanks for all the help so far though!
03-08-2007, 12:48 PM
#18
No T2R for 12-bolt. And Truetracs are helical, not lockers. Again, happy to help, but it's not something as easy as my saying "do this" factors to be discussed.
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Results matter. Talk is cheap. We are miles beyond the success anyone else has had with the 4th gens, and C5, C6, C7 Corvettes,
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2023 UMI King of the Mountain Champion
03-08-2007, 03:25 PM
#20
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Originally Posted by Arctic2002ss
Interesting thread. I've wondered about this myself. If I blow up my 10-bolt I'd like to know what to replace it with that still has good street manners.
Sam, I'm going to try and call you inbetween jobs.
LOL, got to pay to play and, unfortunately, that means picking up a second job for a while. My goal is 1 more year. That way I'll have everything done before I'm 25. Then my expense will be fixing what I broke, tires, and brakes.
