LiquidFire350

iTrader: (8)

ok ive been searching this up and getting mixed opinions, some say go 9" some say go 12 bolt if its A4(which i am), some say 9" with FI, and others say if 10 seconds or less to 12 if 9 seconds or faster go 9", so im gonna give my situation and see what you guys come up with

daily driver A4, sees the track only a few times during the summer, tring to store it for the winters, plan is a forged 383 with spray, but thats not gonna happen for a least a few years
my 10 bolt is starting to howl so im trying to figure out how much i need to have saved up before this thing goes out, im also looking for pros and cons to either one
and i dont plan on going any faster than 10s

oh and can you guys explain what makes a 9" gear swap easier, i know nothing about the 9"

LiquidFire350

iTrader: (8)

ttt.....

LSONE

iTrader: (1)

an a4 is much more forgiving on rear ends, thats why some guys get away with running DR's on the 10 bolt. if your an a4 i say go 12 bolt, a 9'' is the strongest, but not worth the price for an auto IMO.

Dave@KTS

On the street, use the 12 bolt.
Its lighter and requires less horsepower
to turn. If your ready to beat the hell out
of your car at the strip, Go 9". I have 12 bolts
out there running in the low 9's for years.

Dave K

LiquidFire350

iTrader: (8)

so being that my car is 99% daily driven, 1% track time, the 9" would just be over kill

Dave@KTS

I have not heard of anyone breaking a
well prep 12 bolt on the street yet.
In fact I have 10 second 10 bolts
out there that have lived way beyond
what was expected. The trick is to
never wheel hop the rear. This is usually
cured by eliminating stock rubber bushings.

Dave K

Brandon Boomhauer

iTrader: (10)

Are those 12bolts running a full spool, or posi or locker setup?

What axle spline etc?

I've heard of blown 9"s and 12bolts, mainly with posi units... I'm in the market now and got a very nice quote on a 9" but I'm still considering options..

Dave@KTS

The 12 bolts we build for serious racing all use 40 spline Gun drilled
Hi Torque Mark Williams axles and full spool.

Posi units will all fail sooner or later. Posi units dont like the Burn-out
box much either regardless if its in a 9" or a 12 bolt.

Lockers are the best choice for the street/strip guy.

And you know what? The only housing I ever broke in one of my own personal
Top Sportsman cars was a 9" housing. It was braced like we have done for years but it was a stock Ford housing with all the good other stuff. At KTS we now use a Housing from a vender that we modify. Its bad *** bullet proof.

Dave K

SouthFL.02.SS

LiquidFire350

iTrader: (8)

ok then, what is a locker, how does it work, and what makes it better?

you can probly answer all that in one response, i just figured id ask it all to make sure i get all my answers

SouthFL.02.SS

Posi- distributes power from one axle to the other, as needed.
Locker- Locks the two axles together when needed.
Spool- Two axles locked all the time, essentially, one long axle.

LiquidFire350

iTrader: (8)

so with a locker it spinns independently when not needed, as in turning?

and i think ive finally decided on a strange 12 bolt, do i need to shorten the driveshaft?

SouthFL.02.SS

I've never driven in a lockered car, but my understanding is that the lcoker engages and disengages. Whe turning in a parking lot, it will disengage and allow the 2 axles to spin independently. It's a little herky jerky from what I undserstand, and one needs to get used to driving with one.

As for the Strange 12 bolt, no need to shorten the DS. If anything, you may need to buy a new U-joint depending on which yoke you got. Search will help ya on that one.

cyphur

iTrader: (10)

strange 12bolt is a good idea. i personally street a moser 9" with all the goodies, full spool and 35spline gundrilled axles. the only time its a pain in my *** sometimes is when i try and make a 90 degree turn uphill to 20-25% bank in my driveway. other than that its perfectly well mannered once you learn its not a posi and learn how to drive it accordingly. even with a POS spec3 clutch its easy to drive.

Brandon Boomhauer

iTrader: (10)

i'm taking yours for a spin saturday travis, just so you know..

badpewter-z

iTrader: (4)

i prefer the 9" as with having a 4ch abs setup it was the same price for extra insurance and piece of mind. it is street/strip use
locker,35 spline gundrilled axle's other than parking lots its barley noticeable .
even then its not all that bad just push the clutch back in if it gets real jumpy
if you have a 3ch setup either delet the abs or go 12bolt

cyphur

iTrader: (10)

you mean i'll take you for a spin, right? unless you wanna trade cars for a few minutes

Brandon Boomhauer

iTrader: (10)

i drive yours, while you are in passenger seat
you drive mine me in passenger seat. you limited to 4k max.