GT Performance Mods 2005+ Mustang GT Performance and Technical Information

3.73 vs 4.10 which would be better

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Old 6/11/12, 09:25 PM
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Originally Posted by Planeswalker

At 75mph your RPMs will be around;

3.73 2347
This is with a manual 5spd
Confirmed. Looked like 2300ish on the tach.
Old 6/11/12, 10:04 PM
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Originally Posted by agomez
Okay so 3.73s it is do you guys know how much it cost too put them on
My performance mechanic that does my work when I'm feeling to lazy to do it myself charges $150-200. That's with a 100% guarantee that it will not whine or he will fix it! That price is for labor only, of course.
Old 6/11/12, 10:24 PM
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Cause I've called to a shop that only does mustangs and he's charging me 150 and I wanted to know if it was a good price and I was also wondering how are the 3.73s in 5 gear cause the 3.31 that I have seem like it loses power as soon as I shift it to 5th
Old 6/11/12, 10:26 PM
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Originally Posted by agomez
Cause I've called to a shop that only does mustangs and he's charging me 150 and I wanted to know if it was a good price and I was also wondering how are the 3.73s in 5 gear cause the 3.31 that I have seem like it loses power as soon as I shift it to 5th
That's an EXCELLENT price, just hope he does a higher quality job than his price suggests.

Last edited by 11SHELBYGT500; 6/11/12 at 10:29 PM.
Old 6/11/12, 10:37 PM
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Well he also told me if its start whinning to take it in and he will fix it
Old 6/11/12, 10:41 PM
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Also besides the the 3.73s gear do I also need to buy the gear install kit or can I use my stock ones
Old 6/11/12, 10:42 PM
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Originally Posted by agomez
Also besides the the 3.73s gear do I also need to buy the gear install kit or can I use my stock ones
You'll need the kit.
Old 6/11/12, 10:46 PM
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Okay thanks do you kw how the 3.73s feel in 5th gear cause my stock ones losses power as soon as I shift it too 5th
Old 6/11/12, 10:47 PM
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Originally Posted by agomez
Cause I've called to a shop that only does mustangs and he's charging me 150 and I wanted to know if it was a good price and I was also wondering how are the 3.73s in 5 gear cause the 3.31 that I have seem like it loses power as soon as I shift it to 5th
Sounds like a good price to me! As for 5th gear, that's one of my favorite things about the 3.73s, when you're on the freeway at 65-75 mph in 5th if you roll on the throttle the acceleration is immediately there. The vast majority of the time I find that it's really not necessary to drop to 4th to overtake slower traffic, I just roll on the throttle in 5th. I only change down if I'm on a two lane highway and am crossing into the opposing lane to overtake.
Old 6/11/12, 10:54 PM
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Alright awesome cause my car wouldnt want to take off with the stock gears I can't wait to install the 3.73s
Old 6/12/12, 06:22 AM
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Originally Posted by 06blackvertstang
That is a huge jump in mpg!! Is it really true?
According to my little kiwi MPG calculator, yeah. At 55-65MPH from Downingtown, PA to Harrisburg, PA, (turnpike) it ended up at 27.4MPG or something like that. If the drive was longer, I'm sure I would've cracked 28MPG, cause it was still climbing when I got to Harrisburg. When the trip was done... I wanted to hug the car.

Now, keep in mind, if you get rowdy with it... you have to pay. And highway will drop to about 22MPG(per my onboard computer). Not too bad though, all things considered.

Last edited by Rjaniz; 6/12/12 at 06:25 AM.
Old 6/12/12, 07:19 AM
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I would hug the car too but I've nevered calculated my mpgs ill do it with the stock gears and ill see the difference with the 3.73s
Old 6/12/12, 09:16 AM
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Originally Posted by agomez
Okay so 3.73s it is do you guys know how much it cost too put them on
If you have miles on your car plan on getting a master bearing kit and axel bearings and seals. With the parts and labor, I was at like $800 at ford. Labor was 405. Gears and master bearing kit was like 225. All other parts and fluids were like 150. You might wanna get an extra pinion bearing in case they don't get the backlash right the first time. Ford banged me for one at $86 which is more than I paid for the whole fing kit...
Old 6/12/12, 09:39 AM
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Well my car only has 34000 miles on a 2008 mustang gt so should I still get the kit
Old 6/12/12, 12:08 PM
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Originally Posted by muscledom
If you have miles on your car plan on getting a master bearing kit and axel bearings and seals. With the parts and labor, I was at like $800 at ford. Labor was 405. Gears and master bearing kit was like 225. All other parts and fluids were like 150. You might wanna get an extra pinion bearing in case they don't get the backlash right the first time. Ford banged me for one at $86 which is more than I paid for the whole fing kit...
WOW!!!!! I got a SCT Tuner, tune, gears, Royal Purple fluid, and labor for less than that!!!

Talk to your mechanic and see what he will need, my guy didn't need anything but the gears and fluid. He said all that other stuff is for bad/lazy mechanics that can't do the job right (Mileage may change that but he said he has extras laying around). He has done 6 cars in our club, and none of them have had issues so I gotta say he knows his stuff.
Old 6/12/12, 01:04 PM
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Wow that was a good deal for all that but ill make sure ill talk to the mechanic what he needs
Old 6/12/12, 02:21 PM
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Originally Posted by agomez
Well my car only has 34000 miles on a 2008 mustang gt so should I still get the kit
Ehh idk since you have such low miles. I have twice your miles. AND I beat the **** outta my car.
Old 6/12/12, 02:23 PM
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Originally Posted by Planeswalker

WOW!!!!! I got a SCT Tuner, tune, gears, Royal Purple fluid, and labor for less than that!!!

Talk to your mechanic and see what he will need, my guy didn't need anything but the gears and fluid. He said all that other stuff is for bad/lazy mechanics that can't do the job right (Mileage may change that but he said he has extras laying around). He has done 6 cars in our club, and none of them have had issues so I gotta say he knows his stuff.
Price it out bud. Parts ain't cheap. Dealer charges like $95 an hour so do the math. It's not a job I wanted to get done twice. Been down that road before. It's not fun, or cheap.
Old 6/12/12, 03:04 PM
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Originally Posted by Rjaniz

According to my little kiwi MPG calculator, yeah. At 55-65MPH from Downingtown, PA to Harrisburg, PA, (turnpike) it ended up at 27.4MPG or something like that. If the drive was longer, I'm sure I would've cracked 28MPG, cause it was still climbing when I got to Harrisburg. When the trip was done... I wanted to hug the car.

Now, keep in mind, if you get rowdy with it... you have to pay. And highway will drop to about 22MPG(per my onboard computer). Not too bad though, all things considered.
Yeah I would hug my car too!! Wow congrats man. Car of the day trophy for you haha
Old 6/12/12, 03:52 PM
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They told me I only need to buy the gears and oil so I can't wait to see how it performs


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