3.73 gears install - Mustang Evolution

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Old 07-28-2014, 10:03 AM   #1
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3.73 gears install

Had a shop install my gears and the mechanic told me
"I had to go negative shims and still did not line them up perfectly"
I pulled my car out the way it went in fine thankfully. But do you guys think it was a bad set of gears? Or bad mechanic. He explained he was lining up the ring and pinion and even had to take off all the shims and he still could not get it perfect?


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Old 07-28-2014, 10:09 AM   #2
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Originally Posted by borteg227 View Post
Had a shop install my gears and the mechanic told me
"I had to go negative shims and still did not line them up perfectly"
I pulled my car out the way it went in fine thankfully. But do you guys think it was a bad set of gears? Or bad mechanic. He explained he was lining up the ring and pinion and even had to take off all the shims and he still could not get it perfect?


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as long as they aren't whining... but if they do, bad mechanic

Also, way to copy my stripe :p


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Old 07-28-2014, 10:23 AM   #3
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3.73 gears install

Lol a rare car indeed sir! hadn't seen another one yet but we can leave that for another topic!
So yea I have that mechanic that couldn't do it, and another that wants me to buy the whole assembly instead of trying to replace the gears, too much "work" I guess I'm going to have to go out of town since the next guy down charges $1000 for install


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Old 07-28-2014, 11:46 AM   #4
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Where do you live? That's Insane

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Old 07-28-2014, 02:27 PM   #5
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I was inquiring about installing 3.73 gears at my dealership and they told me...

1) installing the gears would void my power train warranty. (even though the dealer would be installing them)

2) The price they would charge wouldn't be worth it. (he said it would be over $800+i would have to still buy the parts)

3) it stresses the transmission too much. (?)

The service writer really turned me off to gears after he told me this stuff.
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Old 07-28-2014, 02:38 PM   #6
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Quote:
Originally Posted by blackstang1 View Post
I was inquiring about installing 3.73 gears at my dealership and they told me...



1) installing the gears would void my power train warranty. (even though the dealer would be installing them)



2) The price they would charge wouldn't be worth it. (he said it would be over $800+i would have to still buy the parts)



3) it stresses the transmission too much. (?)



The service writer really turned me off to gears after he told me this stuff.

Did he mention 3.31 since those were optional? Just wondering what he had to say about those gears, unless you already have 3.31.


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Old 07-28-2014, 02:58 PM   #7
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Originally Posted by blackstang1 View Post
I was inquiring about installing 3.73 gears at my dealership and they told me...

1) installing the gears would void my power train warranty. (even though the dealer would be installing them)

2) The price they would charge wouldn't be worth it. (he said it would be over $800+i would have to still buy the parts)

3) it stresses the transmission too much. (?)

The service writer really turned me off to gears after he told me this stuff.
This is why you don't go to the dealer
Also, different dealers have different opinions on what will void your warranty.
And it doesn't put any extra stress on the transmission.


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Old 07-28-2014, 04:39 PM   #8
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I doubt just installing 3.73 gears would void any warranty other than the read end warranty.

It is when you go in to the computer with an aftermarket tuner and change any calibrations to correct the speedometer that does.
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Old 07-28-2014, 05:20 PM   #9
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My warranty is up already anyway lol I do some mechanical work so I maintain my vehicle just don't have the tools for the gear install that's why those prices are ridiculous I live in south texas


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Old 07-28-2014, 09:14 PM   #10
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The V6 with a 2.73 gear does also have a factory calibration for a 3.31 gear that can be done at the dealer in the service department through the Ford IDS that will be a factory calibration and not an aftermarket change to correct the speedo. Just a little info for those who like trivia.
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Old 07-28-2014, 10:41 PM   #11
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Originally Posted by blackstang1 View Post
I was inquiring about installing 3.73 gears at my dealership and they told me...

1) installing the gears would void my power train warranty. (even though the dealer would be installing them)

2) The price they would charge wouldn't be worth it. (he said it would be over $800+i would have to still buy the parts)

3) it stresses the transmission too much. (?)

The service writer really turned me off to gears after he told me this stuff.
The 3:73 gears does the complete opposite of stress the transmission. It makes it easier on the transmission so that dealership was blowing smoke up your a $$.

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Old 07-29-2014, 05:23 AM   #12
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Probably a bad mechanic, I have 4.10s on my 2013 V6 with MpT tune, and loving every second of it. Here in NC, my ford dealerships were charging me $800+ lowest I've found was in Raleigh which was far. Still wasn't cheap, they were estimating about $600+. So I found a shop called pro dyno in SC, a hour and a half far from my location. They charged me $300 with taxes. Professional shop and certified. They work on all kind a of mustangs. Just keep looking for a cheaper certified shop near you.


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Old 07-29-2014, 07:01 AM   #13
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Bad mechanic maybe, but bad set of gears are not out of the question. All it takes is not machinig the surface where the pinion shim rests enough and it could take no shim and still not get you the right pattern. Haven't seen it myself, but never say never.

Anyone having gears done should google gear pattern images, learn what looks right, take the day off, and ask to see the pattern when the mechanic does it. At least then you know the pattern was checked and get to see it first hand. I'd even take pics in case something goes wrong down the line. Ask to see it like you are generally interested (even if you are not), vs checking up on the mechanic.
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Old 07-29-2014, 12:30 PM   #14
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He did not. I have 2.73.


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Old 07-29-2014, 12:48 PM   #15
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He did not. I have 2.73.


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Old 07-29-2014, 01:21 PM   #16
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He didn't. I have 2.73


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Old 07-29-2014, 02:16 PM   #17
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My local dealership is charging 3 hours at $105 and hour to install so that is not too bad.
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Old 07-29-2014, 02:27 PM   #18
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The 3:73 gears does the complete opposite of stress the transmission. It makes it easier on the transmission so that dealership was blowing smoke up your a $$.

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Good to know! I guess I shouldn't get them done at a dealership then.


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Old 07-29-2014, 05:56 PM   #19
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Would 3.31s be more beneficial? I like 3.73 as I've been in some 5.0s with them, but don't really know too much about the "best" gear ratio to have. Anything has to be better than the 2.73...👎 not a fan...
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Old 07-29-2014, 10:52 PM   #20
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When it was all said and done, how much was the total cost for the gears, installation kit, and shop cost?
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Old 07-31-2014, 01:43 AM   #21
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For me it was 600-650

2014 v6 blacked out with dark yellow super snake. airaid cai, bbk tb, bama tunes, 3.73, and magnaflow competition exhaust.

---------- Post added at 01:43 AM ---------- Previous post was at 01:42 AM ----------

And it was worth every penny I even get better gas mileage in the city Which is 80% of my driving

2014 v6 blacked out with dark yellow super snake. airaid cai, bbk tb, bama tunes, 3.73, and magnaflow competition exhaust.
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2014 v6 blacked out.. the only way to do it. Airaid cai, bbk tb, 93htune, 3.73 gears, and magnaflow competition exhaust
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Old 07-31-2014, 07:35 PM   #22
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You can buy a new complete 8.8 rear end for less than $1000 from speed concepts. They are new take off units. 31 spline, with trac loc and any gear in stock.
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Old 07-31-2014, 08:13 PM   #23
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How hard is it to drop and replace the complete rear end? Looking at my '14 it seems it would just be the brakes, LCA,UCA and panhard bar and springs, Could this be done on high jack stands with a few jacks in a driveway?
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Old 08-01-2014, 04:54 PM   #24
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My mistake they are $1099 at this time. Call for an update. These are take offs with less than a mile. They bolt right up and should take an afternoon to install. What you might need is the right coupling for your application. You need the flat one for the V6. Use a puller to remove the stocker. Tighten the nut to specs. The rear may come with a coupling for a V8, you can get the right one from Shaft Masters. They have two different bolt patterns. V8 and V6. Have fun.
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Old 08-01-2014, 07:50 PM   #25
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I'll update soon I am going back to my hometown to maybe get it done there I know there's a great shop otrtizperformance that does only ford and mustang work they even do the cams there themselves but we might have a possible nitrous build comin with the gear install!


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Old 08-04-2014, 09:55 AM   #26
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I'll update soon I am going back to my hometown to maybe get it done there I know there's a great shop otrtizperformance that does only ford and mustang work they even do the cams there themselves but we might have a possible nitrous build comin with the gear install!


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Luis does great work! I'm sure he will get you squared away!

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