View Full Version : Should I go with a 9 or 12 Bolt for my TA??


TACruiser
11-28-2004, 09:22 PM
I am having a Twin Turbo installed on my 2000 Trans Am, WS6 in 2 weeks. I will need a new rear end, but I don't know what I should go with?? The Ford/Moser 9 Bolt, the Moser 12 bolt or the Strange 12 bolt??? Also do they all come with an option of gears?? I would probably go with a 3.90 if available. Also would I be able to keep my abs with all of them???? With the TT I will have around 500 rwhp... Thanks!!!

2MuchRiceMakesMeSick
11-29-2004, 02:07 AM
Well more importantly why kind of differential do you plan on getting. A 9" with a posi would be alot weaker then a 12 bolt with a spool. I personally would go with a 9" with a spool (check sig). If you cant handle a spool look at a locker setup.

boosted03cobra
11-30-2004, 01:04 AM
i would go with the 9"

TACruiser
11-30-2004, 11:08 AM
What's the difference between a posi and spool??? Also what is a locker?? I pretty new with rear ends... Thanks!!

LOnSLO
11-30-2004, 12:23 PM
With 500 or so rwhp, I would either go with a 12 bolt w/ spool, or a 9" with Powertrax locker.

Mooobunnny
11-30-2004, 04:03 PM
What kind of action is the car going to see? Road course....drag racing........top speed runs......driving to church....etc...?

That will have a lot to do with the posi you will need.

SouthFL.02.SS
11-30-2004, 04:14 PM
9" with spool if it's gonna see any real 1/4 mile track time. As mentioned above, the weak link in what we all see as the "indestructible 9 inch" is the posi.

Matt D
11-30-2004, 04:33 PM
9" with spool if it's gonna see any real 1/4 mile track time. As mentioned above, the weak link in what we all see as the "indestructible 9 inch" is the posi.

:werd: you can't go wrong with a 9" with spool...it can take some hardcore abuse. i highly recommend it, well worth the money!

PRAY HRD
11-30-2004, 08:38 PM
a Detroit Locker will hold some 1000+ hp. your 500rwhp should not hurt a spool or a locker unless the rear end is messed up.

later,
Dave

TACruiser
12-01-2004, 12:21 AM
Yeah with a good tune and some race gas I'm sure I will be topping the 500rwhp mark... I don't drag race, but I like to have the power for the street... I rarely floor it from a stand still though, but I don't want to take chances... Down the road I'll probably put in a short block and heads/cam because this hobby is an addiction, lol!!! Thanks!!

777
12-01-2004, 09:56 AM
If you had a posi how much power will it hold...and no 5000rpm clutch dumps...maybe 3000 though...also if you had to have a posi which would be stronger a 9" or a 12 bolt...how much stronger...and is it worth it to get a 9" over a 12 bolt if you are going to use a posi...

SouthFL.02.SS
12-01-2004, 10:00 AM
A 9" with a locker is a good compromise. Unless you're going to roadrace the car (posi would be necessary for that), a locker is the way to go.

777
12-01-2004, 11:00 AM
this would be my 100% daily driver...driven prolly 50+ miles a day with lots of stop and go...all city driving...so i'm not thrilled about a spool...and not to mention i might make only a couple trips to the dragstrip a year, if that...mainly just for fun on the street...i just want to make sure it will hold up...which i'm sure it would with just a posi...i need my car to be extremely reliable

TACruiser
12-01-2004, 12:06 PM
this would be my 100% daily driver...driven prolly 50+ miles a day with lots of stop and go...all city driving...so i'm not thrilled about a spool...and not to mention i might make only a couple trips to the dragstrip a year, if that...mainly just for fun on the street...i just want to make sure it will hold up...which i'm sure it would with just a posi...i need my car to be extremely reliable


Yeah for me it's kind of the same way.. But I only take my car out on nice days and have only put on 1,500 miles this year if even. I don't drag race, for the only 2 times I went it was closed, hehe.... I just want to cruise and have power for when I want the thrill and have the music blasting and get a big rush!!!

I just found out that if I went with a 9'' with a locker, (which I'm quoting the guy that wrote this to me) as far as running a factory rim on a narrowed rear, it can't be done. The reason is that by pulling the rim in 2", you'll rub the inside of the fender well, and the tire would be so far under the car, that it wouldn't look right. so to run this rear, you'll need a new set for proper fitment and appearance. Plus since I would never change my factory rims I will have to look into other options.

So maybe the best way to go is the 12 Bolt with a 3.90 gear... Since I am not going to the drag strip all the time, but will probably go once next year just out of curiousity too see what my times are.

I'm going to Speed Ink today and will get another opinion... Thanks!!!

2MuchRiceMakesMeSick
12-01-2004, 12:39 PM
this would be my 100% daily driver...driven prolly 50+ miles a day with lots of stop and go...all city driving...so i'm not thrilled about a spool...and not to mention i might make only a couple trips to the dragstrip a year, if that...mainly just for fun on the street...i just want to make sure it will hold up...which i'm sure it would with just a posi...i need my car to be extremely reliable

Take a ride with someone with a spool.

With my new M/T tires Id bet you couldnt tell that I even had one

777
12-01-2004, 12:47 PM
haha...i would...IF someone had anytype of racing car at all that was near me...the only car that i know of that has anything more than exhaust is my friends 94 trans am...and all it has is a fairly small cam and bolt-on's...only manages low 13's...bu that is on some super skinny 18" tires (well tires on 18" rims...i think they are like 225/40/18)

Kenafin_02TA
12-01-2004, 12:53 PM
Another thing to factor into this...do you have abs and tcs or just abs? If you have abs & tcs, you can go with either a 9" or 12-bolt and keep your abs & tcs. If you only have abs, you can only go with a 9" if you want to lose your abs. (They don't make a 9" with only abs, it's either abs & tcs or neither of them.) You can get a 12-bolt though with only abs if you only have abs (and want to keep it).

chpmnsws6
12-01-2004, 01:07 PM
Well more importantly why kind of differential do you plan on getting. A 9" with a posi would be alot weaker then a 12 bolt with a spool. I personally would go with a 9" with a spool (check sig). If you cant handle a spool look at a locker setup.

go with a spool. i had a locker in my 9 inch and hated it... its actually nicer with the spool

chpmnsws6
12-01-2004, 01:09 PM
reliable- you can't break a spool! nor can you wear one out. don't take corners like your in a vette and you'll be fine

you can get a 9 inch in the factory size. i actually narrowed mine 1 1/2 inches from the factory size to fit my centerline rims

777
12-01-2004, 02:59 PM
i think i'll try posi...then if i have problems switch to the spool...i'd rather just see how the posi works for me first before i go buy a spool...i'd rather not have to worry about "taking corners like a vette" but if i have to i will

chpmnsws6
12-01-2004, 03:35 PM
i tried already.... its a waste of time, labor, and money..... but i had to go through the same thing you are now..... you finally just listen and do it, and thank the people who told you so in the first place :thumb:

TACruiser
12-02-2004, 11:24 AM
Well I went with the Strange 12 Bolt with Super Strength Posi and reluctor. Thanks guys for the help!!!

SouthFL.02.SS
12-02-2004, 11:28 AM
^ Very good purchase! Congrats.