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Best rear for me

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Old Feb 24, 2005 | 02:23 PM
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Default Best rear for me

What is the best rear for this setup.
forged 408 (~500+RWHP)
occasional N2O (300 shot (wet direct port)
373 gears
drag radials
street car
I Was thinking about a 9" because it is less likely to break
so what options should i get on the 9"?
I have a 99 w/o traction control!
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Old Feb 24, 2005 | 02:49 PM
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Get a Billingsley 9" with a Locker. Do NOT, DO NOT get a posi with the 9"- the posi won't hold up to much abuse. The 9"/Locker combo is very strong.
No TCS is not a problem- just delete your ABS.
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Old Feb 24, 2005 | 02:54 PM
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Or get a spool with the 9" but no posi
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Old Feb 24, 2005 | 02:56 PM
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Originally Posted by HAMRHEAD
Or get a spool with the 9" but no posi
Yeah, but no posi!!!
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Old Feb 24, 2005 | 04:05 PM
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i have a full spool in my moser 9" in my DD...it can be a little touchy under 10mph, but nothin you don't get used to. but a 35spline full spool is somethin i'll never worry about breakin
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Old Feb 24, 2005 | 06:01 PM
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What is wrong with the posi? Doesn't posi just mean that the wheels spin together?
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Old Feb 24, 2005 | 06:14 PM
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Originally Posted by landonew
What is wrong with the posi? Doesn't posi just mean that the wheels spin together?
The posi unit is the weak point in the 9 inch. Your only "strong" options are a locker or a spool.
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Old Feb 24, 2005 | 06:30 PM
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thanks for the info. Is there anywhere i can read about the differences between posi, locker and spool. I am an engineer and would like to know the mechanical differences between the three. I did search but couldn't turn up anything.
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Old Feb 24, 2005 | 07:42 PM
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From what I understand, a posi will selectively distribute power to the 2 axles, a locker will lock the two axles together when there is a surge of power (while still allowing separate axle rotation when turning), while a spool basically has the two axles locked together all the time, basically making 1 axle (causing one of the rear wheels to spin/jump in spurts when turning to compensate for the smaller turning radius of the inside tire).

Someone with more knowledge than I, please elaborate, as I may have described something incorrectly in the above paragraph.
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Old Feb 24, 2005 | 07:51 PM
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Originally Posted by SouthFL.02.SS
From what I understand, a posi will selectively distribute power to the 2 axles, a locker will lock the two axles together when there is a surge of power (while still allowing separate axle rotation when turning), while a spool basically has the two axles locked together all the time, basically making 1 axle (causing one of the rear wheels to spin/jump in spurts when turning to compensate for the smaller turning radius of the inside tire).

Someone with more knowledge than I, please elaborate, as I may have described something incorrectly in the above paragraph.
That's the way I understand it. That said, anyone wanna trade a Strange 12 Bolt for 9" with a locker?

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Old Feb 24, 2005 | 08:51 PM
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what about spline? What does that represent, and which one is right for me?
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Old Feb 24, 2005 | 09:13 PM
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Originally Posted by landonew
what about spline? What does that represent, and which one is right for me?
Spline is the number of teeth/grooves cut into the axle. 31 spline is thinner in diameter than a 35 spline due to the smaller diameter required to contain 31 splines.
12 bolt: you want at least 33 spline
9": at least 31 spline

35 spline is pretty hardcore.
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Old Feb 24, 2005 | 11:56 PM
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all the things southfl has said are true.

with that much power, you will want to have somthing back there you wont have to worry about. this is because running a 300shot of gas is going to cause more problems everywhere else and a stout rear end will be one less "weak link" to shut you down.

a 9" w/ a locker and 35 spline axles would be in mine if i was making 800+ hp.

p.s. - i have found that a "spool" is called so because it somewhat resembles a spool of thread (except its about 12" long) and has NO MOVING PARTS. it simply connects the axles together inside the center section and basicly gives you a solid axle.

with a 9", you can swap center sections around, simply slide the axles out enough to clear the locker/spool and remove the whole chunk. the chunk is center section that contains the moving parts of a 9". you can have one with higher gears and a locker for the street and maby another with a spool and lower gears for when you slap on the hoosiers and go to the track
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