spool tru trac posi??????
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Joined: Apr 2007
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From: Phiadelphia Ms. to Houston Tx.
i have a spooled 9 inch and i always run a MT DR or ET Street and have no problems on the street i drive my car everywhere so i say spool for track but its streetable and if you just race every one and a while i'd say detroit true trac diff. its a good street ride and raceable
An old post of mine. Should still apply for the most part.
This is what I gathered from looking around before replacing my diff.
The TrueTrac doesn't have clutches.
It uses worm gears rather than spider/side gears/clutches found in Eatons .
It is said to be more street friendly than a locker due to a softer engagement/dis-engagement. A drawback I've personally experienced (as well as a few others [https://ls1tech.com/forums/gears-axles/568520-detroit-tru-trac-diff-anyone-got.html]) is some "slop" on accel/decel/coast. It results in a slight clunking as the "play" is taken up. This just may be the nature of it.
Verdict is still out but I know mines been like this since day one. It is said to not be as strong as a locker but better than an eaton/auburn.
Mine is in a Strange 12bolt behind a 6xx rwhp M6 and has seen about 7-8 passes so far at the track. Launching at 4k-5k on 325/50/15 MT DR with 1.6-1.7 60' @ 3750 lbs. Holding up so far. I'll see what happens when I put a slick on it.
I think it would last for some time behind an A4.
Pics from my blown eaton and truetrac install. (Post# 5)
https://ls1tech.com/forums/gears-axles/507193-what-broke-your-12-bolt-whos.html
Please excuse the description. It's just a basic understanding of how I think it works based off of pics and things I've read.
A Locker has a set of discs/pucks with flat square teeth cut into the face of each.
These "disks" push together and lock into each other to connect the 2 axles while going straight. When you turn or pull into a parking spot, the "disks" disengage and can cause a "racheting" sound as the teeth pass across each other as well as some "lunging".
I think this may have been more of an issue on earlier designs. Once you straighten out the "disks" "click" back together.
I may be wrong on this as I don't have one. The diff may remain open until wheel slip occurs.
This is said to be the strongest diff without going to a full spool.
Auburn ( spider/side gears, no clutches, cones of side gears press into case for posi)
Eaton (spider/side gears, clutch packs)
Very similiar to the Auburn. The back of the side gears have clutch packs rather than the cone.
TrueTrac (worm gears, no clutches) http://www.detroitlocker.com/DT.htm#
Locker http://www.eaton.com/EatonCom/Produc...cker/index.htm
Spool (Locks both axles together at all times)
The TrueTrac doesn't have clutches.
It uses worm gears rather than spider/side gears/clutches found in Eatons .
It is said to be more street friendly than a locker due to a softer engagement/dis-engagement. A drawback I've personally experienced (as well as a few others [https://ls1tech.com/forums/gears-axles/568520-detroit-tru-trac-diff-anyone-got.html]) is some "slop" on accel/decel/coast. It results in a slight clunking as the "play" is taken up. This just may be the nature of it.
Verdict is still out but I know mines been like this since day one. It is said to not be as strong as a locker but better than an eaton/auburn.
Mine is in a Strange 12bolt behind a 6xx rwhp M6 and has seen about 7-8 passes so far at the track. Launching at 4k-5k on 325/50/15 MT DR with 1.6-1.7 60' @ 3750 lbs. Holding up so far. I'll see what happens when I put a slick on it.
I think it would last for some time behind an A4.
Pics from my blown eaton and truetrac install. (Post# 5)
https://ls1tech.com/forums/gears-axles/507193-what-broke-your-12-bolt-whos.html
Please excuse the description. It's just a basic understanding of how I think it works based off of pics and things I've read.
A Locker has a set of discs/pucks with flat square teeth cut into the face of each.
These "disks" push together and lock into each other to connect the 2 axles while going straight. When you turn or pull into a parking spot, the "disks" disengage and can cause a "racheting" sound as the teeth pass across each other as well as some "lunging".
I think this may have been more of an issue on earlier designs. Once you straighten out the "disks" "click" back together.
I may be wrong on this as I don't have one. The diff may remain open until wheel slip occurs.
This is said to be the strongest diff without going to a full spool.
Auburn ( spider/side gears, no clutches, cones of side gears press into case for posi)
Eaton (spider/side gears, clutch packs)
Very similiar to the Auburn. The back of the side gears have clutch packs rather than the cone.
TrueTrac (worm gears, no clutches) http://www.detroitlocker.com/DT.htm#
Locker http://www.eaton.com/EatonCom/Produc...cker/index.htm
Spool (Locks both axles together at all times)
Thread Starter
Teching In
Joined: Nov 2007
Posts: 17
Likes: 0
From: Erie Pa
thanks guys! my car is dd in the summer(only like 5 months) and i have never been to the track but would like to try it sometime. i only put 5000 miles on last year. i was looking into building up my z from the ground up. figured i start with the rear end and end up with a street monster with around 5 or 600 horse i dont knwo if this helps your explanations at all
thaks again
thaks again
thanks guys! my car is dd in the summer(only like 5 months) and i have never been to the track but would like to try it sometime. i only put 5000 miles on last year. i was looking into building up my z from the ground up. figured i start with the rear end and end up with a street monster with around 5 or 600 horse i dont knwo if this helps your explanations at all
thaks again
thaks again
Trending Topics
Hey SSmokin, I'm in the market for a 12 bolt and was leaning towards Strange. I was told that you cannot install a TruTrac w/ the strange 33 spline axles, can you confim if that statement is true?
Also since you have a Strange can you comment if you were in the market for a 12 bolt would you get another one or Moser or unbiased? Thanks man.
Right now it's looking like Moser w/ Trutrac or Strange with Eaton HD posi for me.
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Hey SSmokin, I'm in the market for a 12 bolt and was leaning towards Strange. I was told that you cannot install a TruTrac w/ the strange 33 spline axles, can you confim if that statement is true?
Also since you have a Strange can you comment if you were in the market for a 12 bolt would you get another one or Moser or unbiased? Thanks man.
Right now it's looking like Moser w/ Trutrac or Strange with Eaton HD posi for me.
Also since you have a Strange can you comment if you were in the market for a 12 bolt would you get another one or Moser or unbiased? Thanks man.
Right now it's looking like Moser w/ Trutrac or Strange with Eaton HD posi for me.
Mine didn't originally come with one. When I installed the trutrac, I didn't notice anything out of the ordinary and it went together without incident.
I'd pick up another strange if I was looking for a 12 bolt again. Haven't had any issues with it besides fragging the old posi.
The rear originally came with a spool, but when I broke the driver wheel studs, I opted to swap in the tru trac at the same time. The rear is a Strange 12 bolt...and I have had no problems with the tru trac. I have noticed some slack when say im backing up and put it in 1st gear and start to move forward, but its minimal and doesnt do it all the time. I love the rear with the tru trac...the spool with 315 nittos would shake the car apart when taking tight turns
how much power do you expect to make? I see you're making 414rwhp already...if it was me, i would pick up the Tru Trac and be done with it since its alot stronger than a standard posi
Tru-Trac, if it breaks your screwed, Eaton posi is re-buildable.
If I want to change to a spool later I can, I'm not totally sure that those strange axles mate up to well to the trutrac. I know you did it but I'm a little leary
That Eaton HD Posi is a pretty badass posi, it should easily handle a 10 sec car.
My car will eventually get something like a 402 and hopefully make 500hp ish, it's by no means done but, I think something like a 10.5 is as fast as it will ever go.
