Cascade Crew

scott in wa. · Posted: Fri Nov 03, 2006 10:14 am Post subject: 9 inch ford

We are a ways out on doing this.
but we are thinking of putting in a 9inch under our 3rd gen.
I have a line on a 9inch for free or cheep.
I was wondering what rear end, do we want, what year? Car? Or, truck????
We plan on doing all the welding and fab our selves, at some point in the future.
What 9 inch rear would be the best? Are they all the same?
Thanks
Scott

Quasi-Traction · Posted: Fri Nov 03, 2006 11:03 am Post subject:

scott,

The basic answer is 'no' not all cases are the same with the Ford 9"

I dunno if you guys are planning on doing cutting/welding on one off an actual car, or buying like a Currie or Mosier setup.

If you are fabricating your own spring perches and track arm mount the best thing to do is measure your axle flange to flange, and find one off a ford passenger car or truck that is the same length flange to flange.

here's a handy guide about ford 9" rears.

http://www.kevinstang.com/Ninecase.htm

Twilightoptics · Posted: Fri Nov 03, 2006 6:51 pm Post subject:

Brandon and I were playing with this idea for me... cost came to around $1000-1500 easy and that was with a $200 rear housing WITH 3rd member.

You need new ford ends, and then custom axles to fit the length and the bolt pattern of our wheels. Gears that you want the right ratio, posi unit for it, etc etc. I'll just by one completely done and not worry about did I do this or that right. Yeah it's another $1000... but it will NEVER break.

Plus, The 10 bolt only gives with slicks at the 330HP mark. And with a stick. With the auto it was fine.

izcain · Posted: Fri Nov 03, 2006 6:54 pm Post subject:

There are certain years where the 9 inch has a totally smooth pumpkin and those are the most sought after since they claim that they are stronger then the ones that have the indent in them. Are you planning on an aftermarket case or using a stock ford one?

QwkTrip · Posted: Sat Nov 04, 2006 9:36 am Post subject:

I would think twice about building your own rearend unless you have some metal fabrication skills. You could have a shop modify it for you but there are already places that sell complete units and have all the kinks worked out.

I think your best bet is to start searching for a modified Camaro chassis that somebody is off-loading. See if they will part out the rearend. Also, I heard that a Ford 9-inch is not as efficient as a 12-bolt Chevy. I don't know the difference in efficiency but however slight it's going to get less power to the ground.

Nathan J · Posted: Sat Nov 04, 2006 10:53 am Post subject:

well thats a hardone to say really, yes a 9in takes more power to turn then a 12bolt but it stronger, reason a 9in takes more is there is always 2 pinion teeth contacting the ring gear, where as a 12bolt only has one. also
contact quickperformance there on ebay and such, alot of g body guys use them. they will make a bolt in 9in housing all bearings and such plus 28-35spline moser axles for 850 to your door. all you have to do is buy a thirdmember either from them or put one togeather your self.

Nathan

Quasi-Traction · Posted: Sat Nov 04, 2006 12:26 pm Post subject:

Twilightoptics · Posted: Sat Nov 04, 2006 3:19 pm Post subject:

I don't think you're going to notice the power drain on a 9inch vs a 12bolt on our cars. It's supposed to be a percentage. If you had MAD power then you might see a significant difference.

Just what I've heard.

Nathan J · Posted: Sat Nov 04, 2006 4:02 pm Post subject:

no i do not believe you would ever feal the diff between the 2. put them on a dyno and just changing 12bolt to 9in you might see a small diff but thats it.

QwkTrip · Posted: Sat Nov 04, 2006 4:06 pm Post subject:

That's a fair statement but a little bit here... a little bit there... it can add up to a significant amount. It is attention to the smaller details that will make a car perform above and beyond. I think izcain is a good example. I've noticed his mind is always dealing with the small details. I think that is the primary reason his car runs so hard compared to the rest of us.

Nathan J · Posted: Sat Nov 04, 2006 4:33 pm Post subject:

thats true his car does run very very well, but i will take a 9in ford in my car over a 12bolt, easyer gear changes, bolt in axles, cheaper then a aftermarket 12bolt. hell i would put a Gm 8.5 in before a 12bolt, it is a stronger rear in many ways.

QwkTrip · Posted: Sat Nov 04, 2006 4:40 pm Post subject:

My 12 bolt uses Ford style axles but it's an aftermarket design. Not a reworked GM 12 bolt.

Nathan J · Posted: Sat Nov 04, 2006 5:40 pm Post subject:

ya im not shur why i put in bolt in axles lol. like everything some people like things that some others dont, I just have never been a huge fans of gm rear ends. But some people like to keep there chevys all chevy, and i like to do that but i will let one ford part slip in hehe. Go surf around on some off the drag sites, from lower power to big power there is a reson 95% of racers are usen 9in fords aftermarket or not they are a stronger rear end.

QwkTrip · Posted: Sat Nov 04, 2006 5:47 pm Post subject:

izcain · Posted: Sat Nov 04, 2006 6:44 pm Post subject:

I bought my Strange "S" case from quickperformance.com and had them throw in the 4.56 gears and detroit locker and it worked great. I recently changed to 4.10 and when I set up the new gears the old ones were dead on as far as wear goes. They're a great company!

rjmcgee · The Hammer Joined: 08 Jan 2004 Posts: 2328