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Offline Cookieboystoys

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help identify 8" rear
« on: May 27, 2013, 06:50:19 PM »
I have a tag - can anybody help identify specs on this 8"?

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Mike Modified

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Re: help identify 8" rear
« Reply #1 on: May 27, 2013, 07:17:04 PM »
http://www.fordification.com/tech/rearends_ford08.htm
 
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Re: help identify 8" rear
« Reply #2 on: May 27, 2013, 07:34:37 PM »
Thanks Mike!

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Offline Cookieboystoys

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Re: help identify 8" rear
« Reply #3 on: June 18, 2013, 07:51:23 AM »
here's another question...

If I have a 79 4 speed with a stock 3.75 and I swap in this Mustang II 8" will I have to get a new drive shaft? or will the one currently in the Pinto work?

also I think I recall some options for junk yard aluminum drive shafts that will work for a Pinto but can not recall what cars they can be found in?
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Offline bbobcat75

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Re: help identify 8" rear
« Reply #4 on: June 18, 2013, 08:57:08 AM »
THE ALUM. DRIVE SHAFT IS FROM A AWD AEROSTAR VAN BUT WILL ONLY WORK WITH A 5 SPEED!!! THE LENGHT IS TOO SHORT BY ABOUT 2-3" TO WORK IN A 4 SPEED BEEN THERE WASTED MONEY ON THAT!!    WOULD THINK YOUR DRIVESHAFT FROM YOUR CAR WILL WORK WITH THE 8" REAR END!!
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Offline Cookieboystoys

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Re: help identify 8" rear
« Reply #5 on: June 18, 2013, 09:23:50 AM »
Thanks Bbobcat75... I have a 6.75" pinto rear and that 8" both pulls and plan to do some measuring tonight, just wondering if someone has done this swap with a MII rear and knows for sure.
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Offline bbobcat75

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Re: help identify 8" rear
« Reply #6 on: June 18, 2013, 09:56:00 AM »
I HAVE NOT DONE THE SWAP MYSELF BUT HAVE SEEN ON HERE THAT THE GUYS SAY THE MOUNING PLATES ARE IN DIFFERENT SPOTS AND HAVE TO BE CUT AND RE WELDED SO NOT JUST A BOLT IN JOB AND LITTLE FAB WORK IS NEEDED FROM WHAT I HAVE READ!!
 
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Offline Cookieboystoys

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Re: help identify 8" rear
« Reply #7 on: June 18, 2013, 10:32:50 AM »
the 8" I have was already installed in an 80 Pinto I scrapped, I will measure and compare the mounting plates too later tonight. I always thought it was the same and just the rubber insulators were different...

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Offline Pinto5.0

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Re: help identify 8" rear
« Reply #8 on: June 18, 2013, 11:10:42 AM »
The rubbers should be the same. I was told the only difference was the brake cable length. I've seen a couple posts lately about differences but I'd like to know the truth. I have 2 MII housings at home.
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Offline Cookieboystoys

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Re: help identify 8" rear
« Reply #9 on: June 18, 2013, 12:07:12 PM »
anybody have a quick link/know where to purchase new rubbers?
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Offline dennisofaz

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Re: help identify 8" rear
« Reply #10 on: June 18, 2013, 12:31:48 PM »
Hi Cookie,


Check this link out: [size=78%]http://12.200.47.68/itemdy00.asp?GEN0=&GEN1=&GEN2=&GEN3=&GEN4=&GEN5=&GEN6=&GEN7=&GEN8=&GEN9=&TRAN85=Y&T1=1624+01&dep_key1[/size]


These are supposed to work.


Dennis

Offline Pinto5.0

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Re: help identify 8" rear
« Reply #11 on: June 18, 2013, 02:26:29 PM »
That's the link I was gonna post. My new ones came from there but I need to order 2 more. I didn't realize I need 4 when I bought them.
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Offline Cookieboystoys

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Re: help identify 8" rear
« Reply #12 on: June 18, 2013, 04:10:54 PM »
Thanks Dennis! I'll be getting some of those :)


Hi Cookie,


Check this link out: [size=78%]http://12.200.47.68/itemdy00.asp?GEN0=&GEN1=&GEN2=&GEN3=&GEN4=&GEN5=&GEN6=&GEN7=&GEN8=&GEN9=&TRAN85=Y&T1=1624+01&dep_key1[/size]


These are supposed to work.


Dennis
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Offline Cookieboystoys

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Re: help identify 8" rear
« Reply #13 on: June 18, 2013, 08:03:39 PM »
Measure and compared.... everything looks exactly the same! Yea!

1975-76 Mustang Rear - 3.00:1 limited slip

vs.

1980 6.75 Pinto Rear - 3.08:1 one wheel wonder
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Offline Pinto5.0

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Re: help identify 8" rear
« Reply #14 on: June 18, 2013, 09:51:25 PM »
That saves me from doing it this weekend. Did you measure the E-brake cable? MII is supposed to be 3"+ longer & should be the only difference then.
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Offline Cookieboystoys

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Re: help identify 8" rear
« Reply #15 on: June 18, 2013, 10:25:57 PM »
e-brake = no I didn't, I'll have to look into that
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Offline dennisofaz

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Re: help identify 8" rear
« Reply #16 on: June 18, 2013, 11:47:16 PM »
Hi,


Years ago i did the 6.75" to 8" swap and the parking brake cable mounting hole in the backing plate was bigger in the 8".  Can you check the hole size to see if they are the same.  If not Rock Auto has the Mustang II cable that will fit into the 8", but the overall cable length is 6" shorter than the stock Pinto cable which might be a problem.


Dennis

Mike Modified

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Re: help identify 8" rear
« Reply #17 on: June 19, 2013, 12:33:45 AM »
When I put a MII 8" under my '77, as far as I could tell, it had the same brake shoes, cylinders and drums as the 6.75 that was in my Pinto and freshly rebuilt.  So I merely unbolted the original brakes from the little axle, not breaking open the hydraulics, then pulled it out and bolted the 8" in.  The 6.75" brakes bolted on to the 8", so no worries about parking brake cables.
 
Mike

Offline Cookieboystoys

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Re: help identify 8" rear
« Reply #18 on: June 19, 2013, 07:52:08 AM »
When I put a MII 8" under my '77, as far as I could tell, it had the same brake shoes, cylinders and drums as the 6.75 that was in my Pinto and freshly rebuilt.  So I merely unbolted the original brakes from the little axle, not breaking open the hydraulics, then pulled it out and bolted the 8" in.  The 6.75" brakes bolted on to the 8", so no worries about parking brake cables.
 
Mike

I was online last night checking part #'s for drums, shoes and brake parts... all were the same MII vs Pinto. I will look into the e-brake cable hole tonight.
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Offline Pinturbo75

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Re: help identify 8" rear
« Reply #19 on: June 19, 2013, 07:54:57 AM »
same here, used the origonal brakes complete on the 8"....did it just as mike did..
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Offline Pinto5.0

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Re: help identify 8" rear
« Reply #20 on: June 19, 2013, 11:35:59 AM »
Wheel cylinders are the same as well. I had a set for my 8" already & they went right on my 6.75" in my wagon a few weeks ago. The Bendix spring kit for the 8" was an exact match as well.
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Offline Wittsend

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Re: help identify 8" rear
« Reply #21 on: June 19, 2013, 04:26:28 PM »
Maybe Ford did things different in later years, but my '73  6-3/4" had a different sized brake drum center hole than the 8."  When I got my rear end I was thrilled I had opted to spend the extra $10 and get it drum to drum. It was only after the fact I found out the center holes were different. As I recall the center hole in the 6-3/4" was smaller than the 8."

In the end it didn't matter. I welded the 6-3/4" into the Turbo Coupe so it could be hauled away.  Then I recouped the cost of the 8" by selling the 8.8 from the Turbo Coupe!

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Re: help identify 8" rear
« Reply #22 on: June 19, 2013, 05:08:31 PM »
Maybe Ford did things different in later years, but my '73  6-3/4" had a different sized brake drum center hole than the 8." 
Tom

yes, this is true... 71-73 are different and the wheels from them will not fit on 74 and up axels because of that center part :)
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Re: help identify 8" rear
« Reply #23 on: June 23, 2013, 03:58:11 PM »
[quote author=dennisofaz link=topic=22533.msg137963#msg137963 date=137161723
Years ago i did the 6.75" to 8" swap and the parking brake cable mounting hole in the backing plate was bigger in the 8".  Can you check the hole size to see if they are the same. 

Dennis


Dennis, in this case with the 1975/76 Mustang II 8" rear I'm putting into the Bobcat I was able to measure the E-brake hole and it's the same as the hole found on the 6.75" I pulled from an 80 Bobcat parts car. I will be able to reuse all brake parts and the E-brake cable too.

The only difference I have found between the 2 rears is the breather valve. On the 6.75 it's on the pass side/top of the pumpkin and on the 8" it's a hollow bolt to hold down the brake valve with a rubber hose  attached for the breather. There was a piece of tubbing attached with a bend so it would point down on the 8" rear end breather
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Offline dennisofaz

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Re: help identify 8" rear
« Reply #24 on: June 23, 2013, 10:13:43 PM »
Hi Cookie,


Thanks for the information.  I bought a new breather/brake distribution/hose for a pinto, the old ones hose was cut, and it is good to know that the breather hose can be made to work. I i put on new brakes this year and I am glad to hear that all the parts, with the exception of the drums, will work.   


Dennis

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Re: help identify 8" rear
« Reply #25 on: June 24, 2013, 08:01:03 AM »
? ? ? in my case with the MII  8" rear end.... all parts will work for the swap - drums, pads and all hardware. Why wouldn't the drums work for you?
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Offline Cookieboystoys

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Re: help identify 8" rear
« Reply #26 on: June 24, 2013, 09:31:46 AM »
Help! Ideas? Suggestions

the breather for the 8" rear end has the threads stripped. Not inside the rear, that looks good but the breather that screws into the rear end and holds down the brake line block has very little tread left and will not hold down tight. I've been to the parts store and they look at me like I'm nutz thinking this is a part that can be ordered... so I'm looking for ideas? suggestions? on a replacement?
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Offline 74 PintoWagon

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Re: help identify 8" rear
« Reply #27 on: June 24, 2013, 10:56:52 AM »
I see a hose clamp and a piece of broken hose that the arrow is pointing to???, what threads are you talking about??..
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Re: help identify 8" rear
« Reply #28 on: June 24, 2013, 11:28:32 AM »
use some other means to tighten the brake lines in the block then simply use some JB weld on the rest of the threads to hold the block down ... it does`nt have to be that tight ....

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Re: help identify 8" rear
« Reply #29 on: June 24, 2013, 12:53:59 PM »
I see a hose clamp and a piece of broken hose that the arrow is pointing to???, what threads are you talking about??..

it would look something like this when not attached to the rear end
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