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Old 12-09-2017, 05:52 AM   #1
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7.5 rear end

How much horsepower can the rear end hold before needs to upgrade or anything

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Old 12-09-2017, 09:20 PM   #2
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I don't have a hard number to give you, but Ford began using 8.8 rear ends when the horsepower exceeded about 200 hp on the V6 cars.
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Old 12-10-2017, 10:21 PM   #3
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All depends on how you drive. Are you going launch hard on sticky tires or just spirited driving. I had some where around 350 crank hp on mine for a while with no trouble but no track lock just 1 wheel peel. And no sticky tire drag strip runs or clutch dumps.
Here’s my thoughts. If you are going spend any money on it other than oil change consider up grading to 8.8 with t lock.
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Old 12-11-2017, 10:36 AM   #4
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Just want to do a mild build around 220 horsepower.

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Old 12-11-2017, 07:40 PM   #5
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I would think you’d be fine. Unless of course you’re beating the holy heck out of it. But at that point you’re going to have more problems than just the rear end
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Old 12-11-2017, 09:56 PM   #6
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I agree. Depending upon how the car is driven, the 7.5 might never give you a problem.
The one advantage of swapping to a 8.8, regardless of strength, you get the Trac-loc differential, which can be a help in certain circumstances.
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Old 01-02-2018, 01:24 PM   #7
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I agree with the majority but for about 250 you can get a junkyard 8.8 with the t lock diff already In it

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Old 01-02-2018, 11:51 PM   #8
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In my experience, Ford has always used upgraded-axle strength in factory high-performance options, like '65 Mustang with Hi-Po 289, for example, which got 5-lug wheels and a 9-inch instead of 8-1/2.

Using that fact as a gauge, I would look at an axle's stock usage, and use that to decide whether it can handle what I plan to give it. As stated, anything can be broken, given adequate urging.
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