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  • Which rear end is this? 7.5 or 8.8?



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    1. 06-26-2017, 06:21 PM #1
      DMB
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      Default Which rear end is this? 7.5 or 8.8?

      Hi guys, new member here with a 1985 Mustang GT. Was interested in trying to make more horsepower, but I've heard that the stock 7.5 inch rear end is very weak. I was planning to swap in an 8.8 from a newer fox, but when I looked under my car to look at my rear, it actually looks like an 8.8 to me... just looking to confirm my suspicions. Would be a great surprise if it really is an 8.8.
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      Last edited by DMB; 06-26-2017 at 06:23 PM.
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    2. 06-26-2017, 07:47 PM #2
      qikgts
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      I can't tell from the angle.

      This has should help as you can see it straight on.


      Name: axlechart.jpg Views: 509 Size: 45.3 KB
      '85 GT
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    3. 06-26-2017, 08:25 PM #3
      DMB
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      Thanks that definitely helps. Not sure why the pics posted sideways like that. Looking straight on, it does look like the 8.8. Anyone elses continued input is welcome!
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    4. 06-26-2017, 08:27 PM #4
      xctasy
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      8.8" FOR SURE.




      7.5” rear ends have two flat sides and two rounded sides. They are 9-3/4 " wide.

      The 8.8” rear end has four flat sides, and is 11" wide...a big difference in size, not so much in shape.



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    5. 06-26-2017, 08:34 PM #5
      DMB
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      Wow this is awesome, thank you for the help!
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    6. 06-26-2017, 08:41 PM #6
      DMB
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      Here's another pic showing the whole cover a little better... Name: IMG_0304.jpg Views: 501 Size: 45.4 KB
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    7. 06-26-2017, 10:17 PM #7
      Haystack
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      Yup, definitely an 8.8
      2 1986 cougars (both 4 eyed and 5.0)
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