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Old 10-24-2013, 10:07 AM   #1
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Rear gear install

I have a 13 GT with stock 3.31 gear. I have a used 3.73 to put in it. My question is: is the rear end the same as all other Ford 8.8 rear ends? So nothing different in install than any other year?
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Old 10-24-2013, 11:07 AM   #2
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Pretty much the same with the exception of the pinion bearing, not 100% sure tho, you would want to put new bearing in anyways I would think..
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Old 10-24-2013, 11:14 AM   #3
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Ok good, just didn't want some shop trying to shaft me saying it's newer and different so charge more. I try to do most stuff myself but I don't know anything bout setting backlash and all that mess so if rather have someone do it right.
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Old 10-24-2013, 11:45 AM   #4
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How old are the gears? what yr car were they out of? it looks like they may be diff. in 09 and earlier?
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Old 10-24-2013, 12:08 PM   #5
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Crap, I've had them for awhile and never got round to putting them in last mustang so I don't know but prolly older than 09..... I thought they all 8.8 rear end and the same.
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Old 10-24-2013, 12:36 PM   #6
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Crap, I've had them for awhile and never got round to putting them in last mustang so I don't know but prolly older than 09..... I thought they all 8.8 rear end and the same.
They will work.
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Old 10-24-2013, 12:48 PM   #7
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Great, preciate it. I sure hope so
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Old 10-24-2013, 01:30 PM   #8
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They should work with no problem. The only difference is the larger pinion bearing needed. Here's a link to the pinion bearing you'll need to replace, since it's pressed onto the pinion.

Good luck with the install. Let me know if you have more questions!

Shane
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Old 10-24-2013, 03:33 PM   #9
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The only difference is the larger pinion bearing needed. Here's a link to the pinion bearing you'll need to replace, since it's pressed onto the pinion.

Shane
Actually wrong Shane. The older style pinion bearing can be used.
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Old 10-24-2013, 03:39 PM   #10
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Actually wrong Shane. The older style pinion bearing can be used.
somones about to get banned from shopping at American muscle
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Old 10-24-2013, 04:18 PM   #11
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somones about to get banned from shopping at American muscle
Yea I'll take that chance.

But I did have to set the record straight.
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Old 10-25-2013, 03:48 PM   #12
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Quote:
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Actually wrong Shane. The older style pinion bearing can be used.
I did make one mistake in my post. I should have said- "the only difference is the *smaller or more concave* pinion bearing needed." Which is true.

I think you're forgetting the OP only has a ring and pinion set that was used on an 86-09 8.8 rear end. Although the 86-09 bearing will fit in the 10-14 8.8 housing. The OP most likely doesn't have the 86-09 pinion bearing race to go with his old bearing. It's not wise to use his factory 2013 pinion race with the 86-09 pinion bearing, as they won't seat properly and will cause a failure.

Of course, if the OP does indeed have old 86-09 bearing race, he can install the setup in his 10-14 8.8 housing. I also want to note- bearing's wear/form to each other over time/heat. I wouldn't purchase a new 86-09 bearing race to mate with a used 86-09 bearing. There's a chance you won't have a problem, but why risk it at that point?

Hope this helps clear things up!

Shane
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