9 INCH TECH QUESTIONS

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Post  frank13 on December 26th 2010, 8:13 pm

OK TRYING TO PIECE TOGETHER A 9 INCH FOR THE STANG

DECIDING ON PARTS TO PUT IN

THINK EITHER 31 OR 33 SPLINE
LOCKER DIFF3.70 GEARS
ECT

WHAT AM I LOOKING FOR.......MAINLY STRIP LITTLE STREET, DONT WANT A SPOOL....

FOUND THIS http://cgi.ebay.com/ebaymotors/NASCAR-Ford-9-inch-31-spline-H-case-detroit-locker-_W0QQcmdZViewItemQQhashZitem35aec42e7fQQitemZ230565359231QQptZRaceQ5fCarQ5fParts

WHAT IS THE SIGNIFICANCE OF AN "H" CASE....ARE THERE COMPATIBILITY ISSUES I NEED TO WATCH FOR?

MORE QUESTIONS

WHAT LEGNTH DO I NEED FOR A STOCK 2002 FORD MUSTANG
CAN I BUY BRACKETS TO WORK WITH MY STOCK SUSPENSION TO HAVE WELDED TO THE REAR
DO I NEED CUSTOM AXLES OR DO THEY MAKE A STOCK AXLE TO FIT....TALK TO ME PEOPLE!
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Post  whatbumper on December 26th 2010, 8:31 pm

I would go with 35 spline for what you were talking about building.

H case just means it is the big bearing case not the stock stuff. NASCAR does not make much torque and their cars are light so they don't need as much axle.

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Post  frank13 on December 26th 2010, 8:40 pm

SO THE H CASE IS GOOD?

I AM THINKING OF PICKING UP A STOCK 9 INCH IF ONE IS MADE THAT FITS THE CORRECT LEGNTH
REMOVING THE BRACKETS
WELDING ON NEW BRACKETS,
PICKING UP A SURPLUS CASE,LOCKER AND GEAR CASE AND GOING FROM THERE
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Post  bosshoss on December 26th 2010, 11:28 pm

Not sure about a stock deal as far as length goes. But any housing you cut old brackets off and then weld new ones on to will be warped. You will have to either straighten it in a press or remove the axle bearing ends and relocate them square to the axles. A jig is required for this. Anything that you will run slicks with should have 31 spline aftermarket axles at a minimum. A good aluminum pinion support is another virtual must with slicks.

A true trac or Detroit locker with aftermarket 31 spline axles. A stock case (preferably an "N" case) with a good pinion support would be the minimum in my opinon.

That being said with a big block and slicks you will eventually break something, axles, the stock case, the locker.

Myself I would be going to an aftermarket iron case, pinion support, 35 spline locker, 1350 u-joint. Package deals look pretty good these days from moser and others.

dkp
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Post  72mav on December 27th 2010, 12:20 am

You can cut the brackets off with a cut-off wheel. And then finnish with #36 grit or flapper wheel. Dont torch it though.This shouldnt warp it. You can always cool it off periodically with a wet rag also.

But when you put new ends and brackets, it should be put in a jig like Dean said.
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Post  whatbumper on December 27th 2010, 12:21 am

http://www.quickperformance.com/index.htm

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Post  studly on December 28th 2010, 4:06 pm

whatbumper wrote:http://www.quickperformance.com/index.htm


X2
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Post  68stangbbf on December 28th 2010, 9:35 pm

Hey Frank. I have a currie 9" 31 spline with Detroit Locker. You will need brakes for it. Only drawback might be it has 4 lug axles. It's in excellent condition and has less than 500 miles on it. PM me if you interested. I'm in your area... Boothwyn PA. Price will be right... Oh... It's for a fox body...

Jim K


Last edited by 68stangbbf on December 28th 2010, 9:36 pm; edited 1 time in total (Reason for editing : More info)
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Post  frank13 on December 28th 2010, 11:12 pm

send me a price or a phone number to frank513@yahoo.com
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Post  68stangbbf on December 29th 2010, 10:41 am

email sent.
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Post  frank13 on January 2nd 2011, 6:18 pm

Jim,

I emailed you back today! I should be up on Thursday or this weekend to check it out.

Frank
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Post  frank13 on February 24th 2011, 12:34 am

Ok so i found some housings locally....

They are going to need 99-04 suspension mounts welded on, and the old mounts taked off....

any tips or tricks?

is this something i can do in the garage with a mig welder?

anything i need to do for prep..any bracing i should install?

Frank
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Post  frank13 on February 24th 2011, 5:29 pm

ok i see i need a jig of some sort, where can i buy or how can i make one....

I am big fan of learning how to do everything myself even if it is more expensive in the beginning
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Post  Mike R on February 24th 2011, 11:00 pm

Frank, I would give these guys a call http://www.quickperformance.com.

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Post  frank13 on February 24th 2011, 11:41 pm

yeah i was told they are good. But id like to know how to do it.
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Post  GaryS on February 25th 2011, 10:12 am

I read somewhere that NASCAR Detroit Lockers are different. Something about modifications for left turns only. Just might want to check it out.
I have the jig to narrow and/or replace bearing ends. I have used it several times. YES...warpage is an issue. So is welding sheet metal. Slow down and cool the metal. The jig helps. I tack weld the whole housing to my bench or to to my frame table. Getting the inside of the housing clean after all this work is real important and quite difficult. I finally found a shop that had a large enough hot tank to clean them. Good time for a back brace or a truss.
Just a couple of steps to add to the list....
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Post  frank13 on February 25th 2011, 3:18 pm

the jig you are talking about, is it the long pipe with the inserts that go where the bearing go to keep it all straight?

Should I keep that in when i do the suspension mounts and the rear brace?

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Post  GaryS on February 26th 2011, 9:37 am

Yep...the long piece of solid bar stock with the bearing cup adapters on the ends with the center section bolted in. Welding the housing to a flat surface also gives you a 'bench mark' to square and align everything that you are welding in place.
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Post  quick 52 on February 28th 2011, 9:40 pm

detroit lockers only come in 28,31 and 35 spline. just tack your ends on while measuring and setting bracket i to tack the housing to a I beam fixture then cut the end lose and use a bearing fixture align bearing ends and weld
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Post  DILLIGASDAVE on March 1st 2011, 4:17 am

Here's my ancient housing jig setup I made years ago. The C/L alignment bar works with both small & big bearing housing ends. And the jig table rotate 360* to make it easier to do assorted welding on housings.
9 INCH TECH QUESTIONS Housingalignmentjig-table1


The C/L alignment bar it's self isn't used to hold the housing straight while other assorted welding is done to the housing (brackets, back brace, etc, etc) that's not it's job. Holding the housing "straight" (tweaking/preloading the axle tube centerlines around if necessary) while welding on the housing is done by bolting/clamping/tack welding the housing to the jig table. The C/L alignment bar's only job is to hold the housing ends in place while tacking/welding them in place. This is done after all the other assorted welding is done to the housing.
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Post  Mike R on March 4th 2011, 10:02 pm

Frank, if you still want to do your own housing, contact this guy, Addicted2blnalky@aol.com he makes housing narrowing jigs. Here's a link to his ebay add http://cgi.ebay.com/ebaymotors/FORD-9-GM-10-12-BOLT-REAR-END-NARROWING-JIG-/220747299803?pt=Motors_Automotive_Tools&hash=item3365907bdb. Looks like a good tool at an affordable price. I'm going to get one myself.

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Post  frank13 on March 11th 2011, 10:57 pm

68stangbbf wrote:email sent.

so i went to see the "barely used" rear and all i can say is wow!!!!!!! One of the best internet or wherever deals ever!

Looks practically new, even had the user manuals for the detroit locker, all receipts everything....pics in morning!

Picked up the rear (which i priced through currie tonight at 2800bucks) for 400!!!!! I dont think i could find a better deal on a rear EVER!!!


thanks again Jim!!!!!!
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Post  f250mike on March 12th 2011, 12:03 am

Sweet deal there Frank.
That alignment fixture in the ebay link was $409 shipped by itself. I would have sent you mine to use but you would have still been in for a bunch of $$$ in parts.
Now get busy so we can see some track videos Smile
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Post  68stangbbf on March 12th 2011, 12:48 am

No problem Frank. Glad I could help you out.

Jim K
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Post  frank13 on March 12th 2011, 8:14 pm

9 INCH TECH QUESTIONS IMG_0814

9 INCH TECH QUESTIONS IMG_0815

9 INCH TECH QUESTIONS IMG_0813
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