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Old February 17th, 2013, 04:56 PM   #1
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Default 9 inch traction

Having no experience with either product, i need some advice from the off road world. I am building a ford 9 inch for my v8 powered cj-7. At this point i do not have a functional gear carrier and am considering two options. Option one, I purchase an empty open carrier and stuff it with an Aussie lunch box locker- cost $350. Option two, new Detroit true track LSD- cost $475. Jeep splits its time on ice cream runs and high speed 2wd dune climbing. I sure hope this doesn't split 50/50. thanks for any feedback
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Old February 18th, 2013, 07:16 PM   #2
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You're only running 29" tires, who cares?
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Old February 18th, 2013, 08:10 PM   #3
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who said anything about 29" tires? Im currently running 33's and looking to get 35's when the 33's are all used up. And i suppose i care because i took the time to start this thread. if you have any experience with either set up id like your input, otherwise, thanks for the bump.
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Old February 18th, 2013, 08:52 PM   #4
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your V-8 only has 200 horsepower because it's worn out and leaks oil out of the rusted out oil pan. You won't break either axle setup on a worn out chevy 305, it doesn't matter which setup you pick.
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Old February 18th, 2013, 08:58 PM   #5
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Go full-case locker, selectable if you can afford it. ARB or E-Locker, the lunchbox locker will not stand up well to 35 or 37 inch tires if you really wheel it.
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Old February 18th, 2013, 09:23 PM   #6
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thank you 78mitsu, that is the kinda opinion i was looking for. I dont know the track record for the lunch box set ups and dont want to spend the money twice. I dont understand the hostility from our elvis friend, but i would like to hear any other opinion that may be out there.
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Old February 18th, 2013, 09:32 PM   #7
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Why not just weld it?

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Old February 18th, 2013, 09:41 PM   #8
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my wife likes to drive it from time to time and i just don't want that call that "it did something funny" and now its on top of somebody's sunfire at the mall. I have considered the welded or mini spool idea, just not completely sold on it yet. seems like alot of guys that spend time on the street end up getting away from full time lockout.
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Old February 19th, 2013, 05:33 AM   #9
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For what you are doing a lunch box locker will work fine. If you are going to spend the money on a full locker, don't waste it on a limited slip.
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Old February 19th, 2013, 07:18 AM   #10
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Originally Posted by whiterhino View Post
For what you are doing a lunch box locker will work fine.
X2, I ran the Powertrax LOCK-RIGHT in a 78 bronco front and rear with 36" Irocks and a warmed up 400, they held up for two years before I sold the axles to a fellow Jeeper who is still "5 years later" running them. For your application they will work fine with money left over for more ice cream
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Old February 19th, 2013, 01:27 PM   #11
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My 9" has a full spool in it now, and I would like to switch it over to a regular locker..... I'm thinking a lunch box would work for me.
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Old February 19th, 2013, 01:45 PM   #12
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If your wife is going to drive it I would go with the TrueTrac. It is used in the 9" application in most racing scenes and is tough as nails. A true all gear LSD that does not need rebuilding and is just shy of a true locker. Great for all year driving and is almost unnoticeable in a short Jeep platform.

Rear "lockers" in a short wheelbase are hard to get used to.

A spool is very predictable but hard on parts and creates embarrassing tire squeal in tight turn situations.

If you want more input on the TrueTrac contact Bo'sCJ7 on here he has been running one for almost a year in all circumstances (sand, mud, snow, pavement etc.) with V8 power.

Good luck.
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Old February 19th, 2013, 03:32 PM   #13
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If your wife is going to drive it I would go with the TrueTrac. It is used in the 9" application in most racing scenes and is tough as nails. A true all gear LSD that does not need rebuilding and is just shy of a true locker. Great for all year driving and is almost unnoticeable in a short Jeep platform.

Rear "lockers" in a short wheelbase are hard to get used to.

A spool is very predictable but hard on parts and creates embarrassing tire squeal in tight turn situations.

If you want more input on the TrueTrac contact Bo'sCJ7 on here he has been running one for almost a year in all circumstances (sand, mud, snow, pavement etc.) with V8 power.

Good luck.
I agree with this. I run a spool in my CJ5, on the street, sand dunes, sand drags, and asphalt drags, but I'm used to it. I think you're much better off going the route above.
And for the record, some of us do run 30'ish" tall tires. Tire size doesn't mean shit, you can still break stuff.
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Old February 19th, 2013, 04:41 PM   #14
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From the looks of your first post it was evident that you had no clue how to get decent feedback. I was hoping after my first post that you would get where i was going, but you still haven't got it.

At least we know what size tires you're running, (you're welcome) but high speed 2wd hill climbing in a 950 horsepower jeep is dangerous with a half ton axle.

Sorry, i'm just trying to help.
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Old February 19th, 2013, 05:03 PM   #15
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Quote:
Originally Posted by BigBlockBlazer View Post
If your wife is going to drive it I would go with the TrueTrac. It is used in the 9" application in most racing scenes and is tough as nails. A true all gear LSD that does not need rebuilding and is just shy of a true locker. Great for all year driving and is almost unnoticeable in a short Jeep platform.

Rear "lockers" in a short wheelbase are hard to get used to.

A spool is very predictable but hard on parts and creates embarrassing tire squeal in tight turn situations.

If you want more input on the TrueTrac contact Bo'sCJ7 on here he has been running one for almost a year in all circumstances (sand, mud, snow, pavement etc.) with V8 power.

Good luck.
I would agree with this as well. A few things to remember:

Any limited slip differential will act like an open diff if there is no resistance to one side of the differential. For example, when one tire lifts in the air, it will be the one that spins, and the one on the ground will not spin. The simple solution is to apply brake pressure (press the brake pedal) for a bit and the lsd should transfer some torque to the tire that is on the ground. It will never provide the true 50/50 split of torque that a locker or spool does, but it is a great choice when on-road handling is still important.

Mechanical lockers, whether the lunchbox style that you mentioned, or a full carrier locker like a Detroit, will sometimes lock and unlock unexpectedly. This is why I would not recommend this type of locker to someone without offroading experience or a basic understanding of what's going on. Some people refer to these as 'lane-changers'.

You could also look at Yukon Dura-Grips. They are a rebuild-able clutch based limited slip that also allows customization to get the torque bias you want. They are a little less expensive than a True Trac, too.

I have a True Trac in the front of my TJ. It is basically invisible on-road, and provides traction off-road when I need it. Another advantage of the True Trac is that it has no wearable parts like clutch packs and springs.

Hope this helps.
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Old February 19th, 2013, 08:14 PM   #16
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thanks everybody for in input. I talked to James at KOZ offroad today when i dropped off my housing to get narrowed up, he agreed with the LSD set up for a rear axle for the application.

Elvis, its hard to tell the difference between a sarcastic nudge for more info and being a prick when your just reading works on a screen. Next time i wont think your throwing rocks at my rig.
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Old February 20th, 2013, 03:47 PM   #17
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Quote:
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thanks everybody for in input. I talked to James at KOZ offroad today when i dropped off my housing to get narrowed up, he agreed with the LSD set up for a rear axle for the application.

Elvis, its hard to tell the difference between a sarcastic nudge for more info and being a prick when your just reading works on a screen. Next time i wont think your throwing rocks at my rig.
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