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Old 11-23-2008, 05:25 PM   #1
b-blown
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7.5 inch rear question

drivetrain specialties sells a detroit locker ,good gears and axles aswell as a rearcover girdle....how much could our rearends take with these parts installed....I know theres a board member or two that have been known to break the 7.5....lol any answers would be appreciatted....
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Old 11-23-2008, 09:06 PM   #2
EHardy1971
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The ring and pinion is the weak part of the 7.5 in my experience, from the ones that I've destroyed.
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Old 11-24-2008, 05:52 AM   #3
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i would not put any money in a 7.5 because 8.8 is so easy to swap. i seen one bust the spider gears and it was not that bad of car.
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Old 11-24-2008, 06:45 AM   #4
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I think a 7.5 would last awhile behind a turbo 4
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Old 11-24-2008, 06:46 AM   #5
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Quote:
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I think a 7.5 would last awhile behind a turbo 4
would you put all that money in a 7.5?
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Old 11-24-2008, 07:58 AM   #6
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Quote:
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would you put all that money in a 7.5?

why not?


he keeps putting it in slow ass mod motor cars...just like you



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Old 11-24-2008, 08:24 PM   #7
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Quote:
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would you put all that money in a 7.5?
behind a 4 cylinder I would contemplate it. Your looking at least another $300 to put an 8.8 under it (unless you have one laying around the house)
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Old 11-25-2008, 09:36 AM   #8
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The 7.5 is a pretty tough rearend. I've seen them get abused behind 302's in '85 GT mustangs as well as behind some pretty strong 2.3's. And let's face it, the 8.8 can have issues too, if things are not setup right. I wouldn't hesitate to put good parts into an SVO 7.5 rear.

(And remember: the LS1 camaro/transam also has a 7.5" ring&pinion)
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Old 12-13-2008, 07:47 PM   #9
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Quote:
Originally Posted by b-blown View Post
drivetrain specialties sells a detroit locker ,good gears and axles aswell as a rearcover girdle....how much could our rearends take with these parts installed....I know theres a board member or two that have been known to break the 7.5....lol any answers would be appreciatted....
The 7.5 fox axles are the same as an 8.8 fox, They are both 28 spline and the same length. I have one that I pulled from the Capri, It suffered a spider gear failure. I have had several 7.5s and as long as you don't shock load them they will live for a while, If you aren't making lots of tq and are running an auto it will last for a long time. In all honesty I killed on an average of about 4-5 T5s to every 7.5 in my old 84GT but my 79RS never had a rear end issue other than an axle after I went to a C4.
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Old 12-13-2008, 08:43 PM   #10
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Quote:
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I have had several 7.5s and as long as you don't shock load them they will live for a while,
Like side stepping the clutch at 5 grand in a '79 Capri with a 302,in a Wal-Mart parking lot,on a Friday night.















Hypothetically speaking of course.
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