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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 02-12-2010   #1 (permalink)
zhlange is offline Apprentice

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Default 9 inch or 8 inch rear end

Ok, what is the difference between 9 or 8 inch rear end (other than the size)? What are the pros and cons for all sizes?


And how can I tell if mine is 8 inch, 8.8, or 9? Is there a way to measure it?
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Unread 02-12-2010   #2 (permalink)
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here is a nice read up on 8" / 9" Ford rear ends
not much on the 8.8" , but its a nice to know whats under your car
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Unread 02-12-2010   #3 (permalink)
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8.8 is what is found in newer mustangs. 99.9% sure u don't got one of those but if you do it won't have a housing that can be removed and should have a tag on the back saying what it is. 9 inch i believe is the strongest of the 3 8 being the weakest, some may disagree tho, and 8.8 being the average rear end that only gets in these cars by swapping one into it.
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Unread 02-13-2010   #4 (permalink)
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Most say the 8" is good to 450 hp.
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Unread 02-13-2010   #5 (permalink)
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8.8 is the overachiever, and with the 31 spline axles is about the same strength of a 9"
Quote:
Originally Posted by rex1965 View Post
Most say the 8" is good to 450 hp.
i've always heard 350, and if you run slicks, forget 350
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Unread 02-13-2010   #6 (permalink)
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8.8 started mid 80s if the rear part of the diff is smooth no bolts its not a 8.8.Easiest way to tell a 8 from a 9 is the lowest bolt on the 3rd member try putting a socket on it.If it fits its a 8 inch if you can't get it on its a 9 inch.
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Unread 02-13-2010   #7 (permalink)
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When you guys say strongest does that pertain from how much horsepower can you do?
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Unread 02-13-2010   #8 (permalink)
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essentially what the amount of HP the rear end will take before it blows up
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