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  Ford 8", Ford 9", ???

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Author Topic:   Ford 8", Ford 9", ???
Bloose
Gearhead

Posts: 888
From: Milwaukee, WI
Registered: Dec 2001

posted 01-04-2003 06:45 PM     Click Here to See the Profile for Bloose        Reply w/Quote
I think I asked about the 8" in my car last year and didn't get much response. I thought I would try again this year.

As of now I have a 8" w/4.62's in the rear of my '68 lane. I have an AOD and a 289. Last year I ran 14.003 in the 1/4. In the 8" I am running a "poor man posi" in which I added 1 shim each on the side gears. It worked awsome never leaving less than two tracks all year.

The problem is this year I will be using a 3000rpm stall opposed to 2000. I put in 1.7 rockers too. The biggest thing is I will be running NOS up to 150HP. So I am getting a little nervous about the 8" and the "posi" I made.

I have a few options.

1) I could buy a posi for the 8". Factory units as everyone knows are hard to come by and I think way over priced. I know there is an aftermarket one in the $4~500 range. Just not sure if it is worth sticking $400+ into an 8".

2) I could run the Lincoln locker that I have laying around. I have heard that is a handfull on the street though.

3) I could break down and get a 9". The problem here is getting one that will fit into the car. Plus most of the 9"'s I see are the small spline count (28 IIRC), which is the same as my 8". So by the time I make the housing fit, get a 31 spline diff, 31 spline axles, I know I will be at big $$$.

4) I could use a Chrysler 8.25" I have laying around. It is a good axle with stronger shafts than the 28 spline but weaker than the 31. I have a very good factory posi for the 8.25" and would only need gears for it. The width is very close to the width of the axle in my lane I think it is 1/2" narrower. The problem with the 8.25 is it's a c clip design. There are no eliminator kits for it either. I have this axle in my Jeep and beet the snot out of it. So far I have never seen a broken one on the trail.

So what should I do? Not worry about the 8", run the lincoln locker, spend big $$ and go 9", run the Jeep axle, or punt.

Let me know what you think.

B-loose

Fastymz
Moderator

Posts: 22791
From: Reno Nv M&M #1240
Registered: Apr 2001

posted 01-04-2003 06:52 PM     Click Here to See the Profile for Fastymz        Reply w/Quote
Your not going to be running the NOS off the line are you?
If not I'd stick with the 8" and look for a better posi unit.I know that Auto's are alot softer on the launch then a stick is.On my 8" I'm just going to keep running it until I get to much power for it,which I think is around 300 rear wheel HP.And the tires have alot to do with it too.
Do you run slicks,or street tires.

------------------
SCOOP
oddly obsessed with big scoops on little Mustangs

2.26 60'S
14.9 @ 90.86MPH

65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede.

https://mustangsandmore.com/ubb/Fastymz.html

Fastymz
Moderator

Posts: 22791
From: Reno Nv M&M #1240
Registered: Apr 2001

posted 01-04-2003 06:55 PM     Click Here to See the Profile for Fastymz        Reply w/Quote
We run about the same times we should have a friendly no money bet,or a fun competition to see who can run faster this summer.

------------------
SCOOP
oddly obsessed with big scoops on little Mustangs

2.26 60'S
14.9 @ 90.86MPH

65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede.

https://mustangsandmore.com/ubb/Fastymz.html

V8 Thumper
Gearhead

Posts: 4777
From: Phoenix, Arizona
Registered: Dec 2001

posted 01-04-2003 07:38 PM     Click Here to See the Profile for V8 Thumper        Reply w/Quote
Heck, if it's a race-only car, you could spool it for a fraction of the cost of a locker. Currie has 8" cases built by Strange that look like they'd handle the typical pinion support failure problems just peechie keen. Aftermarket cases are typically in the $370 range, another $150 for a good spool and you're all set

------------------
1965 GT coupe, 333ci aluminum headed/solid cammed stroker, four speed, 3.70:1 9"

All Blue Oval, no blue bottle
http://mustangsandmore.50megs.com/V8Thumper.html

Bloose
Gearhead

Posts: 888
From: Milwaukee, WI
Registered: Dec 2001

posted 01-04-2003 10:44 PM     Click Here to See the Profile for Bloose        Reply w/Quote
Planning to run some Hoosier QT's or something like that at the track. The car is not a track only car. Street driven on weekends and things like that.

The NOS will be on at WOT which will be a little out of the hole with the vac secondary carb. So I don't think right off the line but close to it.

I have friends with Jeeps that have run the rear locked up and say it is no big deal. Other people say no way on the street. I am thinking of giving it a shot and seeing how I like it. I was really worried about those spindly axle shafts though. Is it possible to run 31 spline shafts in the 8".

RFC Dale
Journeyman

Posts: 6
From: Wheaton, IL USA
Registered: Jan 2003

posted 01-25-2003 05:47 PM     Click Here to See the Profile for RFC Dale        Reply w/Quote
Having run 8" and 9" rear ends... and seen alot of axles...there are 2 types of 28 spline axles for these rears. Some of them have rather small shafts and the forgings get larger just before the splines are cut. Some of them are the same thickness in the shaft area as the 31 spline axles. See what I'm getting at? I'm not sure which axles you have in your 68, but I have seen the heavier shafts in a 69 Fairlane 9 inch, Maverick 8" and Pinto/Mustang II 8" rear ends. I saw the lighter duty axles in 65 Mustang 8", 64 Fairlane 8" and 73 Mustang 8" rears that I can remember off the top of my head.

mustangboy
Gearhead

Posts: 1343
From: Ont, Canada
Registered: Mar 2002

posted 01-25-2003 07:23 PM     Click Here to See the Profile for mustangboy        Reply w/Quote
Your 8 inch should be fine.I ran the same poor mans posi for a few years.I finally wore out the shims by running my sticky McCrearys on the street.I guess when I turned corners my radial tires would just slip but not with the sticky tires,so the shims eventually wore out and I had no more posi.I got a detroit locker used and put my 4:11s on it and it works great.3500-4000 rpm launches with a stick shift and G-60-15 McCrearys and no problems so far.I would run your rear end as is and when it wears out,then look for a posi or a 9 inch.The nice thing about the 9 inch (besides the strength) is the availability of used gear sets.There's lots of decent ratio's in the junkyards.My dad had a early 60s Econoline van with a 6 banger and a 4.56 posi right from the factory.

------------------
1968 mustang j-code [email protected] 306cu.in, stock ported heads,weiand exellerator,650 holley DP,hedman hedders,comp 292 Magnum cam,4-speed,8 inch 4.11 detroit locker

Bloose
Gearhead

Posts: 888
From: Milwaukee, WI
Registered: Dec 2001

posted 01-25-2003 11:39 PM     Click Here to See the Profile for Bloose        Reply w/Quote
Hmmmmmm, I had finally made up my mind to put an Auburn in the 8" and see how long it took me to break it with the NOS. Now your making me wonder if I should just run the poor man posi???

I figure for what guys are paying for 8" posi's I should be able to get most of my money out of the Auburn if I ever decide to go to a 9".

77 Cobra
Journeyman

Posts: 35
From: Bladen,Nebraska
Registered: Jun 2002

posted 01-26-2003 03:31 AM     Click Here to See the Profile for 77 Cobra        Reply w/Quote
I read a deal on shimming the 8 inch rear to make it a posi.Glad to see someone on here who has done it.I got a few questions about it though?Is it noisey?How does it take corners?I am building a 77 Cobra with a 302 that will be pretty strong street car.Comp Cams 278,9.5/1 comp.,289 Hi Po heads,Weiand double plane intake,carter AFB 650 cfm,Edelbrock gear drive,and headers,with a 4 speed.Do you guys think this 8 inch thing will hold up to the occasional abuse it may get.

mustangboy
Gearhead

Posts: 1343
From: Ont, Canada
Registered: Mar 2002

posted 01-26-2003 11:49 AM     Click Here to See the Profile for mustangboy        Reply w/Quote
Basically the tighter the shims the tighter your rearend will be until it is locked.If the shims are loose enough to let the axles turn independantly they will slowly wear until you will lose the posi effect.Mine lasted a few years on a non daily driver until they wore out but its a good option if you are on a tight budget,and no its not noisy.

------------------
1968 mustang j-code [email protected] 306cu.in, stock ported heads,weiand exellerator,650 holley DP,hedman hedders,comp 292 Magnum cam,4-speed,8 inch 4.11 detroit locker

[This message has been edited by mustangboy (edited 01-26-2003).]

Moneymaker
Administrator

Posts: 29200
From: Lyons, IL, USA
Registered: May 99

posted 01-26-2003 12:02 PM     Click Here to See the Profile for Moneymaker        Reply w/Quote
If you stud the case around the pinion support, you'll never break it with an automatic and your combo.

------------------
Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com

Bloose
Gearhead

Posts: 888
From: Milwaukee, WI
Registered: Dec 2001

posted 01-26-2003 05:45 PM     Click Here to See the Profile for Bloose        Reply w/Quote
Alex,

Not to sound dumb but what do you mean stud the case around the pinion support? Do you mean just use studs instead of bolts for the pinion support? I think I know what you mean. Where would I get the studs?

Thanks,
B-loose

[This message has been edited by Bloose (edited 01-26-2003).]

Kyle
Gearhead

Posts: 458
From: Sumner, WA
Registered: Dec 2001

posted 01-26-2003 06:14 PM     Click Here to See the Profile for Kyle        Reply w/Quote
In my '63 Fairlane, I run an 8" with 4.11 gears and a mini-spool(cheap). I bought good 31-spline axles to fit the 8" too. My plan is to someday get a 9" and spend the money for a good full spool and use the axles I already have. I don't drive on the street, though.

------------------
Kyle Laramore

63 Fairlane: 302, Victor Jr. heads and intake, solid lift cam, super comp headers, MSD 6al and duraspark, 650 DP carb, C4 w/ Hughes converter, man. valve body

66 Mustang coupe: 289, offy intake, Holley 600 vac. sec., long tube headers, 3spd stick

Moneymaker
Administrator

Posts: 29200
From: Lyons, IL, USA
Registered: May 99

posted 01-26-2003 06:48 PM     Click Here to See the Profile for Moneymaker        Reply w/Quote
The 5 bolts that hold the pinion retainer in are replaced by studs with head bolt washers and nyloc nuts.
Any decent parts store (not a chain like pepe boyz, or nozone) will have grade 8 studs.
3/8 x 1 1/4. SAE on one side and USS on the other. Get some thick head bolt washers and SAE nyloc nuts to go with them and you're good to go.

------------------
Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com

66 Racer
Journeyman

Posts: 85
From: West Covina, California
Registered: Aug 2001

posted 01-26-2003 07:25 PM     Click Here to See the Profile for 66 Racer        Reply w/Quote
Well, I just put a mini spool in my 8" and drive it on the street, my daily driver as a matter of fact. Its noticable on turns but you can deal with it. I just barly did it, so i havent done any rain driving yet, 1st time out though im going to be very carefull.

------------------
Under Construction 66 Coupe - - -
306, 10.2:1, 66 289 heads 1.84/1.50, mild port work, comp cams 270H cam, Performer manifold, Holley 600cfm, tri-y headers, 2.5 dual exaust w/flows, centerforce dual friction, 8" 2.79 gears, w/mini spool

1/8th mile - 8.87 @ 83mph

Bloose
Gearhead

Posts: 888
From: Milwaukee, WI
Registered: Dec 2001

posted 01-26-2003 10:08 PM     Click Here to See the Profile for Bloose        Reply w/Quote
Thanks Alex. We have a local HW store with lots of hardware, I wasn't sure if I could get by with just grade 8 stuff, thought there might be something special. I will stop by and pick that stuff up.

Sounds very cool thanks.

A spool would likely work in my car too as I drive it little and never in the rain if I can help it (which I usually can). Everyone says don't do it but I would like to try myself some time.

B-loose

steve'66
Gearhead

Posts: 9835
From: Sonoma,CA,USA
Registered: Mar 2000

posted 01-26-2003 10:22 PM     Click Here to See the Profile for steve'66        Reply w/Quote
A spool on the street with regular street radials isn't a big deal at all. As long as it isn't an everyday commuter.

SteveW

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