View Full Version : 1993 Cobra = 87-88 Turbocoupe rearend?

05-06-2005, 11:13 AM
Matt90GT (http://web.archive.org/web/20040412221201/http://sn95brakes.cjb.net) and FordMuscle (http://www.fordmuscle.com/archives/2003/09/93cobra/) both say that the 1993 Cobra uses the 87-88 Turbocoupe rearend. Can anyone here confirm this?

Chuck W
05-06-2005, 11:18 AM
Yes...aside from the gearing...

05-06-2005, 11:24 AM
Thanks. I was fairly certain, but it never hurts to ask at the source.

05-06-2005, 03:21 PM
Is the TurboCoupe housing the same width as the 87-88 7.5" housing? Just wondering, if so, most of the following dimensions for the 7.5" also work for the TC 8.8.


Chuck W
05-06-2005, 03:43 PM
Yes...they are the same...

05-06-2005, 04:38 PM
Yes...they are the same...
Ok. Pardon my continued ignorance and pestering...

The Ford documents above show the 87-88 Tbird 7.5" to have housings .75" longer on each end than Fox Mustang housings. You say the 7.5" housing is the same width as the TC 8.8" housing. Matt90GT (http://www.corner-carvers.com/forums/showthread.php?t=834&highlight=housing+width) (and many others) say that all Mustang 8.8" housings from 79-98 are the same width (including the 93 Cobra, MKVII, &TC). Post #12 from that thread has a guy "proving" the Fox and SN95 housings are the same. All these options cannot be... What is the truth?

05-06-2005, 05:51 PM
The shafts are longer. :D

05-06-2005, 06:12 PM
I know from experience that for some reason the 7.5 rearend axles are slightly longer than the TC 8.8 rearend axles. The 7.5s axles appear to be about 1/4 longer than the 8.8s. I used 7.5 axles on my 8.8 TC rearend when I kept the drum brakes...

Thunder Chicken
05-06-2005, 06:52 PM
I know from experience when I had new bearings installed in my '88 Cougar that Mustang axles will not work in a T-Bird/Cougar housings without mods. When my bearings were being done the axles were worn, so I set about trying to find new axles (the Ford dealer wanted $800 APIECE!!!). A junkyard sent Mustang axles, which were about an inch too short. The bearings and seals would not ride on a machined surface on the Mustang axle, plus it would make reinstalling the drums impossible. Now, this was a used Mustang axle, and everything outboard of where the Mustang seal rode was rusty. A new axle may have had a nice machined surface for the Cougar's bearings to ride on, but this would not solve the drum problem. Unless Mustangs use a different backing plate or drum the housing would have to be different.

The shop had to put the Cougar back together with new bearings and old worn axles because the correct axles were not available. I drove the car for a few years like that, with Redline synthetic fluid in it. Never got noisey, never vibrated.

05-06-2005, 10:31 PM
Wouldn't the 1993 Cobra housing have different quad shock mounts than the 87-88 TCs? i.e The two housings aren't exactly the same and wouldn't have the same part #, correct?

05-07-2005, 02:23 PM
From Al Kirschenbaum's Mustang 5.0 Technical Reference and Performance Handbook, page 352:

The 1993 Cobra's 8.8-inch rear-end housings are fitted with special bracketry that accommodates their unique rear disc brake systems. Otherwise, the housings used in 1986-and-later Mustangs are practically identical. The 1994-98 Fox-4 Mustang's 8.8-inch rear-end housing is 55.63 inches (nearly 3.5 inches wider than the previous, Fox-body versions).

Also on page 355:

Live-axle (non-independent rear suspension) 8.8-inch Thunderbird housings with 9-inch drum brakes are 1.875 inches wider than the Mustang 8.8-inch housing. T-Birds with 10-inch drums are 3.375 inches wider. (The earlier 7.5-inch rear ends used in both Mustangs and 1983-85 1/2 T-Birds are the same width.)

Al has a few discrepancies with our cars in other places of the book, but in this instance I can't see how he'd be wrong. This book is the Mustang "bible".

05-08-2005, 12:41 AM
When he means "housings" is he measuring it with the axle shafts in?


05-08-2005, 12:42 AM
Why would a 10" shod 8.8 be any wider than a 9" 8.8? The drums are the same width. Kirschenbaum's book is an excellent reference, but there are a several mistakes in his book which makes me take his words with a grain of salt.
I take a truckload of salt with Mathis' books. See why here (http://www.corner-carvers.com/forums/showthread.php?t=4936&highlight=mathis).

05-08-2005, 08:12 AM
The drums are the same width.At the shoes, yes.
At the flange, the 10-inchers are "domed", the 9-inchers are flat.

05-08-2005, 09:24 AM
So can anyone explain why axles from a 7.5 Tbird drum rearend would be longer than a 8.8 TC disc rearend? Thanks


09-14-2005, 11:18 AM
Well from experience, I can tell you this.

I found a 1988 Cougar XR-7 with the hydratrac rear-end (8.8") in a U-Pull-It yard. After rushing to get it home, trying to beat a storm, I found out that it had the exact same width as my 1987 Thunderbird Sport's 7.5" rear end. The cougar rear-end also has the larger 10" drum brakes on it, so I was very happy. Basically all I am saying is that 87-88 cougar XR-7's have the 8.8" rear end which is the same width as the thunderbirds. Just wanted to pass this information around because I know everyone is growing tired of getting a mustang 8.8" rear end, only to find out that thier 7.5" axels won't fit.

Chuck W
09-14-2005, 11:37 AM
Just wanted to pass this information around because I know everyone is growing tired of getting a mustang 8.8" rear end, only to find out that thier 7.5" axels won't fit.

We've covered this in another thread thoroughly.

Also, there are so few of the Cougar 8.8's that even finding one is going to be a chore for folks.

Funky Cricket
09-14-2005, 12:21 PM
man that site from jeremyb's link is full of a bunch of mustang geeks... hehe.. I didn't know anyone would ever want to know THAT much about a mustang.

09-14-2005, 09:38 PM
I really don't see why all you guys are having a problem understanding the axle lengths variations....

As far as I know, I believe it goes like this:

All 8.8 axle housings are the same length for all fox cars (maybe even the sn95's are the same length as the older fox). This means that all the axles should interchange. Some axles may be longer overall than others though, do to ABS on the TC and MK7, and the lack thereof on the Mustang and 88 XR7.

All 7.5 axle housings and axles are the same length before midyear of 1985

After midyear '85, the t-bird/cougar 7.5 axle housings and axles grew approx. 3/4 inch on each side (not totally sure on that exact length). At this point they do not interchange anymore with Mustang axles.

Any difference in total rear end length from side-to-side on the 8.8's used in different models (TC, XR7, Mustang 5.0L, Mark VII) is based soley on the type of braking equipment used.

Please feel free to correct me if I stated something incorrectly.