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Unread 05-21-2008   #1 (permalink)
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Default 1984 Mustang rear end question

So I'm approaching the finish line with my second 4 banger to 5.0 swap the first was an 86 and now I'm working on my 84 coup all I have to do now is put the front things on like the water pump steering pump alternator and for the rest i'll be using eliminator pulleys. But here is what I was wondering now with my 86 I bought a complete used rear end that had 3:73 gears in it from a place here outside of atlanta that sells nothing but mustang parts the rear end was 450 dollars yet pull apart sells rear ends for like 50 and i was wondering what other fords can I take the rearend off of if i can't find a mustang . The rear end that's on the 84 coup is the single traction one that's usually on the 4 bangers. I want posi traction so I can have both wheels spinning.
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Unread 05-21-2008   #2 (permalink)
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I think your best bet is to find one from an '86-93 5.0L Mustang. That way it is an 8.8" w/ trac-lok, has the correct mounting points and correct width. You'll probably be hard pressed to find one that has anything other than the 2.73 gear ratio though. There are other cars that have axles that will bolt in, but they are usually wider. Unless thats what you want.
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Unread 05-21-2008   #3 (permalink)
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Look for a 87-88 thunderbird turbo coupe. They come with a 8.8 and 3.55 for stick and 3.73 auto.. there about a 100 bucks at a u pull it junk yard!
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Unread 05-21-2008   #4 (permalink)
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I would get another Mustang rear, so you won't have any modifying to the mounting points to do. A Mustang 8.8 shouldn't be too hard to find.
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Unread 05-22-2008   #5 (permalink)
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Here in atlanta they're hard to find but what about the 87 and 88 thunderbird turbo coup Cirrus mentioned I know where I can find one right now at a junk yard it's where I got the brackets and crank pulley off for my 84 build because they are the same as on the mustang.
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Unread 05-22-2008   #6 (permalink)
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You might be able to use it, they should be an 8.8. I'm just wondering if it's be a direct bolt in, considering the mounting places.
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Unread 05-22-2008   #7 (permalink)
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'87/'88 Turbocoupes have an 8.8" rear with disc brakes and either 3.55 (w/ manual) or 3.73 (w/ auto) gears. The housing itself is the same width from axle tube-to-axle tube but the axles are each " longer, for a total of 1" axle flange-to-axle flange. That may or may not cause interference with the quarter panel's wheel well lips, depending on the backspacing and offset of the wheels you use. If there is interference, you'll have to use different wheels OR roll the lip or cut it off. Either of those last two options (roll or cut) is a hack job, in my opinion.

You will also have to monkey around with the steel brake line on the chassis and the flexible hose going from it to the axle housing. The pre-'85 V8 Mustang's chassis line ends at the passenger side frame rail, then the flexible hose runs from it to the passenger-side axle tube, which connects to a junction bloc/vent that splits into a hard line for each side. After '85, for V8s, the steel line crosses over to the drive side driveshaft tunnel, then the flexible line goes to the top of the differential housing on the driver side, and splits to each side from there. The vent is in the sa,e location as earlier years. The '87/'88 Turbocoupe is the same as '85+ V8 Mustangs. The Turbocoupe has a short flexible line going to each caliper.

OR you can swap the axles, drum brake system, and hard steel line from your '84's axle housing to the Turbocoupe housing. You will have to remove the Turbocoupes's axle tube vent and replace it with the vent/junction from the '84.

If your '84 has the Quadra-Shock rear suspension and you plan on keeping the shocks in place, you will have to drill a hole in the Turbocoupe's axle-mounted brackets 2" lower than they are now.
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Unread 05-22-2008   #8 (permalink)
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Not to hi-jack....this post but in my 85 it has the 7.5 rear? or could it have the 8.8.....Thanks.........
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Unread 05-22-2008   #9 (permalink)
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The 8.8" rear was first factory installed in Mustangs (and Fox-based Capris) starting in the '86 model year, and only with V8s.
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Unread 05-23-2008   #10 (permalink)
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So basicly will the mounting brackets line up on the 84 coup
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Unread 05-23-2008   #11 (permalink)
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"So basicly will the mounting brackets line up on the 84 coup"

Yes
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