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Discussion Starter · #1 · (Edited)
I’m thinking about trying to sell a set of 8.8” 3.73’s that were in my ‘95, and I was wondering if they would fit in an 8.8” from ‘05 and up? They’re listed as being for the ‘79-04 year models. But what’s different about the 8.8” in the 2014 that would make them not work?
Edit
Steeda says ‘85-‘14 but AM has different Ford Performance part numbers for 3.73’s. They have a ‘94-‘98 and a ‘10-‘14.
What’s the deal?


edit again I spy the differences in AM’s “kits.” The r&p is the same.
 

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I would have thought they were the same for all 8.8". Why are there two kits on AM that have the same price and overlap in years though?
 

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I thought they were all the same too, but not sure . . . my FRPP catalog does not distinguish between years at all; just lists all of the 8.8's together and says "the 8.8" rear end has been the standard in performance since it's introduction in the Mustang in 1986"
 
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I've installed 3:31's from a '14 into an '89 no problem
 

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Discussion Starter · #6 ·
I've installed 3:31's from a '14 into an '89 no problem
I went from 2.73 to 3.73, then to a 3.31 which is what is in there now. I like the 3.31 because it’s real easy cruising around. But sometimes I miss the “pull” that the 3.73’s had. With the 3.31’s I have to downshift and drive it harder to get into “boost” in a hurry (3k rpm). Maybe I should’ve went with a 3.55 but I was afraid it would be too close to the 3.73’s at highway speeds. The 3.31’s need reset because they whine. Was thinking maybe if I sold the 3.73’s I might try a 3.55. Then I’d have a set of 3.31’s laying around. I dunno.
 

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I went from 2.73 to 3.73, then to a 3.31 which is what is in there now. I like the 3.31 because it’s real easy cruising around. But sometimes I miss the “pull” that the 3.73’s had. With the 3.31’s I have to downshift and drive it harder to get into “boost” in a hurry (3k rpm). Maybe I should’ve went with a 3.55 but I was afraid it would be too close to the 3.73’s at highway speeds. The 3.31’s need reset because they whine. Was thinking maybe if I sold the 3.73’s I might try a 3.55. Then I’d have a set of 3.31’s laying around. I dunno.
I have a set of (take off) 3:31's in the garage that I never got to install in my '89 which I no longer have God rest her soul. They were pulled at a dealer on a new car that got an upgrade. I paid around $50 shipped from Ebay.
 
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Discussion Starter · #8 ·
I have a set of (take off) 3:31's in the garage that I never got to install in my '89 which I no longer have God rest her soul. They were pulled at a dealer on a new car that got an upgrade. I paid around $50 shipped from Ebay.
I think the 3.31’s would be a lot better if I was making about fifty more horses. However I like them and I don’t miss the 3.73’s all that often.
 

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I think the 3.31’s would be a lot better if I was making about fifty more horses. However I like them and I don’t miss the 3.73’s all that often.
Sounds like you need more boost!!!
 
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