Sn95 8.8 in my 85 GT - Mustang Evolution

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Old 08-27-2011, 09:22 AM   #1
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Sn95 8.8 in my 85 GT

I everyone. I have an 85 GT with a 7.5 rear. I'm wanting to upgrade to an 8.8 but also do a 5 lug conversion with 4 wheel disc brakes.

So, I know I could get a fox 8.8 and then swap axles and brakes from an SN95, but I am wondering if I can just pull an 8.8 rear from an SN95 and bolt it right under my fox. Will all the bracketry on the SN95 housing bolt right up? This would be the easiest way for me. I understand that e brake cables and brake hoses may be different but that's no big deal.
Any help on this would be great if anyone has done this before.
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Old 08-27-2011, 09:35 AM   #2
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Keep it original. There are many nice 4-lug rims out there. I have seen complications trying to convert it. I used wheel spacers on mine.
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Old 08-27-2011, 09:53 AM   #3
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True, but there are many more wheel options in 5 lug, and it seems to be easier to upgrade my brakes by using SN95 parts.
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Old 08-28-2011, 12:00 AM   #4
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Re: Sn95 8.8 in my 85 GT

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Originally Posted by Klinton View Post
I everyone. I have an 85 GT with a 7.5 rear. I'm wanting to upgrade to an 8.8 but also do a 5 lug conversion with 4 wheel disc brakes.

So, I know I could get a fox 8.8 and then swap axles and brakes from an SN95, but I am wondering if I can just pull an 8.8 rear from an SN95 and bolt it right under my fox. Will all the bracketry on the SN95 housing bolt right up? This would be the easiest way for me. I understand that e brake cables and brake hoses may be different but that's no big deal.
Any help on this would be great if anyone has done this before.
The 95 8.8 should be a bolt in.
The only issue I know of is that the SN95 axles are wider by about .750" - 1" on each side. This will limit your wheel choices somewhat, but will work otherwise.
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Old 08-28-2011, 07:03 AM   #5
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Ok awesome. Thanks for the reply.

---------- Post added at 07:03 AM ---------- Previous post was at 07:01 AM ----------

So I guess the brake hose should bolt right in???
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Old 08-28-2011, 02:27 PM   #6
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Re: Sn95 8.8 in my 85 GT

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Ok awesome. Thanks for the reply.

---------- Post added at 07:03 AM ---------- Previous post was at 07:01 AM ----------

So I guess the brake hose should bolt right in???
No, they won't.
You will be going from drum to disc brakes, so I would expect you will need a master cylinder and some adapters or different hoses at least.
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Old 08-28-2011, 02:34 PM   #7
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You can swap an entire five lug swap from an SN95 and run S197 offset wheels. Worked for me...
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Old 08-28-2011, 02:41 PM   #8
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Ok that's what I wanted to hear. I'm definitely planning on using SN95 parts for the front. So I'll most likely use an SN95 rearend as well. Are there any adapters for the rear hoses that I can buy?
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Old 08-28-2011, 03:15 PM   #9
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No adapters.
Just get the hoses from maximum motorsports website.
For the master cylinder use a 93 cobra and then get rid of the stock prop valve and buy an adjustable one..
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Old 08-28-2011, 03:25 PM   #10
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Ok, is there much difference between the 93 cobra and the sn95 master cylinders?

---------- Post added at 03:25 PM ---------- Previous post was at 03:24 PM ----------

And also, I'll probably wanna replace the brake booster as well. Is there a certain year and model I should go with? Tha ks for the help.
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Old 09-11-2011, 01:46 PM   #11
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I'm stripping a 2000 mustang GT, can I use the complete rear end and the booster in my 87 GT for the brakes and 5 lug conversion?
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Old 09-11-2011, 01:55 PM   #12
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Re: Sn95 8.8 in my 85 GT

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I'm stripping a 2000 mustang GT, can I use the complete rear end and the booster in my 87 GT for the brakes and 5 lug conversion?
I think so, but I'm not 100% sure. Check the rearend width and mounting point measurements to be sure.
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Old 09-11-2011, 02:47 PM   #13
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I actually bought an sn95 rear 3.73 8.8 posi.
I was planning on bolting it under like it is. But I'm going to cut the brackets and move them in and use ranger axles, so that it will be stock width with discs. It looks pretty easy to do. I'm assuming the 2000 rear end will bolt right under there and be the same as like a 94 or 95 rear end.
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Old 09-11-2011, 03:23 PM   #14
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Re: Sn95 8.8 in my 85 GT

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Originally Posted by Klinton View Post
I actually bought an sn95 rear 3.73 8.8 posi.
I was planning on bolting it under like it is. But I'm going to cut the brackets and move them in and use ranger axles, so that it will be stock width with discs. It looks pretty easy to do. I'm assuming the 2000 rear end will bolt right under there and be the same as like a 94 or 95 rear end.
That should work ok.
Cutting and moving the disc brake brackets to work with the Ranger axles should keep your overall width approximately the same.
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Old 09-11-2011, 10:29 PM   #15
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Yeah that's the plan I'm going to the pull n save tmrw to get the ranger axles. I'm ready to get it done. The only issue is that when I was pulling the sn95 axles out yesterday, one of the c clips fell down in where the pinion is and I can't seem to get it out even when I turn the housing over. :/ I guess I'll try a magnet, but it will be hard to get it down in there.
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Old 09-11-2011, 11:13 PM   #16
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Re: Sn95 8.8 in my 85 GT

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Yeah that's the plan I'm going to the pull n save tmrw to get the ranger axles. I'm ready to get it done. The only issue is that when I was pulling the sn95 axles out yesterday, one of the c clips fell down in where the pinion is and I can't seem to get it out even when I turn the housing over. :/ I guess I'll try a magnet, but it will be hard to get it down in there.
Pull and measure one of your axles for length, because the Ranger axles from each side are different lengths. I think you will need the shorter axles.
Be sure to get that clip out before you use the rearend.
Otherwise it might get picked up and ran through the gears which will destroy them.
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Old 09-12-2011, 08:18 AM   #17
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From what I've read, I need the drivers side axles from the rangers. And I'll definitely make sure I get the c clip out. It's just a major pain in the butt. Imayhave to take the pinion gear out to access it better...
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Old 09-12-2011, 08:50 AM   #18
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Re: Sn95 8.8 in my 85 GT

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From what I've read, I need the drivers side axles from the rangers. And I'll definitely make sure I get the c clip out. It's just a major pain in the butt. Imayhave to take the pinion gear out to access it better...
Just so you know:
If you remove the pinion gear, you will likely need to re-set up your rearend gears to ensure the proper contact patch and clearances.
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Old 09-12-2011, 10:35 AM   #19
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You don't think I can just put the same shims back where they came from and everything will be the same that it was?
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Old 09-12-2011, 10:46 AM   #20
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Re: Sn95 8.8 in my 85 GT

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You don't think I can just put the same shims back where they came from and everything will be the same that it was?
Sometimes you can get lucky and get away with that, but not always.
When you loosen the pinion nut you are going to affect the insertion depth of the pinion gear and the crush sleeve has already been crushed so it will need to be replaced too.

Here is an article -8.8 Gear Install that will help you understand why that may not be a good idea.
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Old 09-12-2011, 02:26 PM   #21
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Ok, I went to oreilly's auto parts, and got a magnet. The smallest one they had. And didn't have any luck. So I went to advance auto parts. Got another magnet.... No luck. Went to autozone. Got another type of magnet. Went home, and finally got the c clip out. Lol, what a relief. Also went to the local pull n save and got two ranger drivers side axles. They're approximately 3/4" shorter than the sn95 axles. So I just swapped the axles out from the housing, and it looks like it's good to go. Just have to cut the brake brackets to move all the brakes inward.
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Old 09-13-2011, 05:47 PM   #22
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Re: Sn95 8.8 in my 85 GT

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Ok, I went to oreilly's auto parts, and got a magnet. The smallest one they had. And didn't have any luck. So I went to advance auto parts. Got another magnet.... No luck. Went to autozone. Got another type of magnet. Went home, and finally got the c clip out. Lol, what a relief. Also went to the local pull n save and got two ranger drivers side axles. They're approximately 3/4" shorter than the sn95 axles. So I just swapped the axles out from the housing, and it looks like it's good to go. Just have to cut the brake brackets to move all the brakes inward.
Sounds like you are on your way to project completion.
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