is a 9 inch necessary?
Thread Starter
10 Second Club
iTrader: (8)
Joined: Feb 2004
Posts: 2,846
Likes: 0
From: Milwaukee, WI
is a 9 inch necessary? I know the 9 inch is indestructable but I'm not sure if it is right for my setup and end goal. I now have a headache from trying to read all the posts in my search so I'm just going to ask! I am only running 430rwhp n/a and the occasional TNT 150 but my plans are to go with FI and run somewhere around 700-800rwhp in the end. The car is an A4 and will have a TH400 by the time it gets to the 700 mark. It will see street/some strip duty. I will have 3.73's and drag radials as well. Not sure what setup would work best. I do want some good handling as well so I don't think a spool is an option. Like I said I'm looking to buy for my end result as well since I'm not rich and don't have any sponsors.
Thanks!
Thanks!
!LS1 11 Second Club
Joined: Apr 2003
Posts: 7,133
Likes: 2
From: Miami
The 9" is not indestructable. A 9" with a posi is a weak POS. A 9" with a soft locker or a spool is very strong.
Given you have an A4, I'd say get a Strange 12 bolt with a heavy duty posi. But given your high HP aspirations, a 9" with a Locker may be the way to go.
Given you have an A4, I'd say get a Strange 12 bolt with a heavy duty posi. But given your high HP aspirations, a 9" with a Locker may be the way to go.
A 9" behind an A4 might be a bit on the overkill side...if it lived behind an M6 with a sticky clutch, it would then be necessary if it saw much track duty. I think a well built 12-bolt would fit your bill quite nicely, but it depends on what kinda options you are looking for. With a 12-bolt, you can have either a posi or a spool, but no locker. A 9" has many more options, but are heavier and have more parasitic loss.
If anything tends to break in these rears, it is the posi units. Even a 9" posi unit doesn't last too long, so don't go thinking that these things are completely bullet-proof. They aren't, but pretty much can be with the right parts. How much driveability on the street you want to give up is up to you.
If anything tends to break in these rears, it is the posi units. Even a 9" posi unit doesn't last too long, so don't go thinking that these things are completely bullet-proof. They aren't, but pretty much can be with the right parts. How much driveability on the street you want to give up is up to you.
Thread Starter
10 Second Club
iTrader: (8)
Joined: Feb 2004
Posts: 2,846
Likes: 0
From: Milwaukee, WI
I pretty much decided on no posi cause of the breaking problems I heard about. Can you get a posi then when it breaks or just when you decide get a spool swap in without a whole new rearend? Stupid question but I have to ask! I'm also torn cause a Strange 12 bolt is just as much or close to a 9inch in price. If I will be ok with the 12 bolt for up to 800rwhp on an auto then I think that would be a better choice unless there is something I'm missing?
If you are willing to go with the spool on the 12-bolt, I think it would suit you quite nicely, and fit with less issues than a 9". I would recommend looking at a Strange since they use 2 through bolts on their torque arm mount instead of the Moser's 4 short bolts into blind holes (the Moser 12-bolt is the only one that does this...the Moser 9" casting uses 2 through bolts - go figure).
!LS1 11 Second Club
Joined: Apr 2003
Posts: 7,133
Likes: 2
From: Miami
A 9" with a locker is a decent compromise in driveability bewteen a posi and a spool. It's very strong also.
The Strange 12 bolt with a spool will bolt up much easier than a 9", but the 9" may provide flexibility in that one could in theory have plug-n-play center sections- one with a spool or locker/ one with a posi. Few people have the time to be swapping out center sections, but it's doable.
The Strange 12 bolt with a spool will bolt up much easier than a 9", but the 9" may provide flexibility in that one could in theory have plug-n-play center sections- one with a spool or locker/ one with a posi. Few people have the time to be swapping out center sections, but it's doable.
Thread Starter
10 Second Club
iTrader: (8)
Joined: Feb 2004
Posts: 2,846
Likes: 0
From: Milwaukee, WI
Originally Posted by SouthFL.02.SS
A 9" with a locker is a decent compromise in driveability bewteen a posi and a spool. It's very strong also.
The Strange 12 bolt with a spool will bolt up much easier than a 9", but the 9" may provide flexibility in that one could in theory have plug-n-play center sections- one with a spool or locker/ one with a posi. Few people have the time to be swapping out center sections, but it's doable.
The Strange 12 bolt with a spool will bolt up much easier than a 9", but the 9" may provide flexibility in that one could in theory have plug-n-play center sections- one with a spool or locker/ one with a posi. Few people have the time to be swapping out center sections, but it's doable.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
