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Old 02-22-2005, 12:30 PM
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how to tell fords 7.5 from 8.8

i have a 86 mustang originally a 6cyl now has a 351w and my friends have been telling me that i need to change it to a 8.8 bc it should be a 7.5 for a 6 cyl how do i tell the difference

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Old 02-26-2005, 09:54 AM
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measureing horizontally(side to side, not up and down) the bolt holes are 9.5" apart on an 8.8 housing.
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Old 02-26-2005, 06:47 PM
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The 8.8" has straight sections on all 4 sides, while the 7.5" is curved on the sides and straight on the top & bottom. Both have 10 bolts on the cover.
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Old 02-26-2005, 09:31 PM
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You don't really HAVE to. I swapped a 5.0 into my wife's 86 about 5 years ago. I just KNEW I needed to put in an 8.8", but didn't. To date the 7.5 has held up just fine. I'm sure it will give up sometime, but our situation is such that we can leave it be until it starts giving trouble. Or goes kerbang. Note that we're not running a 351W though. Nor do we race the car or anything.
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