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Unread 03-19-2008   #1 (permalink)
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Default Mustang Rear-end codes

*Foxchassis helped with this thread some info is from him*

If you are wondering what type of rearend or even what size it is this should help. You can find the axle code on the tag that is mounted directly on the axle housing. Another sopt is a white sticker located in the doorjamb there is either a number or letter under axle. Conventional or "open" rear ends break down as follows: 8-2.73, Y-3.08, 5-3.27, F-3.45, 6-3.73. Locking or "Traction Lok" break down as follows M-2.73, Z-3.08, E-3.27, R-3.45, W-3.73.

'79 5.0L Mustangs and Capris did not have Traction-Lok. Traction-Lok was first available in Mustangs and Capris in the '81 model year, and it was optional with the V8, not standard. It became standard with the 5.0L V8 (still optional with the 4.2L v8) starting in the '82 model year.

5.0L mustangs and Capris could not be ordered with a ratio higher than 3.27:1.

There was a 2.26:1 and a 2.47:1 ratio available with a V8 early in the Fox years.

Thunderbird Turbocoupes in '87 and '88 had an 8.8" rear, 3.55:1 with a manual transmission and 3.73:1 with an auto.

Lincoln Mark VII's came with an 8.8" rear, Traction Lok was an option

The only Mercury Cougar that came with an 8.8" rear was the XR7 models and was a Traction Lok with at least a 3.08 gear all others were 7.5"
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Last edited by EagleAutosports; 03-21-2008 at 08:51 PM.
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Unread 03-21-2008   #2 (permalink)
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Great info. This'll help out a lot of people.
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Unread 03-22-2008   #3 (permalink)
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Yeah i heard the thunderbirds have a direct replacement with disk brakes and 3:55 girls for the fox's
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Unread 04-29-2008   #4 (permalink)
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thanks for the info. very informative
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Unread 06-06-2008   #5 (permalink)
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Do you happen to know if Explorer's have the same axle codes as the Mustangs. Thanks.
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Unread 06-07-2008   #6 (permalink)
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Quote:
Originally Posted by Sean Reno
Do you happen to know if Explorer's have the same axle codes as the Mustangs.
The door codes, no.

The axle tags, yes, somewhat. But those codes were not covered in this topic.
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Unread 06-26-2008   #7 (permalink)
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thank you for that info...very helpful.. now i gotta wait till morning when it's light out to go see what I got..haha
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Unread 06-26-2008   #8 (permalink)
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thank you for that info...very helpful.. now i gotta wait till morning when it's light out to go see what I got..haha
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Unread 08-04-2008   #9 (permalink)
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Great Stuff!!
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Unread 08-18-2008   #10 (permalink)
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wow just to see i went and checked out what gears I had in my 88 2.3 it came up as 6 so i guess i have 3.73s
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Unread 12-23-2008   #11 (permalink)
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I just went out to check my door tag and when previous owner had it painted they tore off the door tag
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Unread 01-15-2009   #12 (permalink)
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Thanks alot man. First thing tommorrow morning, I'm going to check. I'm pretty positive I have 3.73, or atleast thats what I was told when I bought the car.
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Unread 03-05-2009   #13 (permalink)
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Awesome thanks been wondering what damn gears i had in the back so i could fix my speedo since i put a 140 mph in it !
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Unread 03-26-2009   #14 (permalink)
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I recently bought an automatic 91 5.0 LX convertible and the previous owner told me those came with a weak 2.25 gear for better mpg on highway.

Anyone here know about that? I can say it surely is weak but won't be for much longer with a 4.10 in it I hope
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Unread 03-26-2009   #15 (permalink)
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No such animal as 2.25:1 ratio. There was a 2.26:1 ratio only in '80 and '81 and only with the 4.2L V8.

The only ratios available for a '91 5.0L/AOD were 2.73:1 and 3.27:1. The former was standard and the later was optional.
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