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Old 01-19-2014, 02:42 PM   #1
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Rear gears

What gears are better 373 or the 48?


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Old 01-19-2014, 02:44 PM   #2
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On a auto 4.10 and on manual 3.73
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Old 01-19-2014, 02:56 PM   #3
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ok thanks and i was looking on american muscle for new axles, what spline would be the best to get. I had no idea they had different ones
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Old 01-19-2014, 03:08 PM   #4
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Anything that is 31 Spline is for GTs and anything that is 28 Spline is for a v6. I wouldn't know what kind to recommend cuz I never got one for mine but if it were up to me I would get a ford racing one but that's just me. Hope this helps.
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Old 01-19-2014, 03:10 PM   #5
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Anything that is 31 Spline is for GTs and anything that is 28 Spline is for a v6. I wouldn't know what kind to recommend cuz I never got one for mine but if it were up to me I would get a ford racing one but that's just me. Hope this helps.

The 99-04 Mustangs V6 and GT came with 28 spline axles. If you want to upgrade to 31 spline you will need the axles and a 31 spline differential. The gears just have to be 8.8
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Old 01-19-2014, 03:10 PM   #6
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And I would go with 4.10 for a manual or auto. Don't fear the gear!!!!!
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Old 01-19-2014, 03:13 PM   #7
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^ Dude right if you want to really take off the yea you should judt get the 4.10.
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Old 01-19-2014, 03:15 PM   #8
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does the 4.10 gears give more top end or acceleration
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Old 01-19-2014, 03:17 PM   #9
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The 4.10 will make you accelerate quicker... It also helps you get into your power band and stay there when shifting into the next gears.
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Old 01-19-2014, 03:17 PM   #10
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Gears help you accelerate better way batter than stock one. Also bigger gears mean higher RPM.
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Old 01-19-2014, 03:20 PM   #11
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My top speed was lowered with 4.10


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Old 01-19-2014, 03:23 PM   #12
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My top speed was lowered with 4.10


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Yea that's going to happen. You trade top speed for acceleration.
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Old 01-19-2014, 03:25 PM   #13
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Pretty much OP you have to pick which you like better... Acceleration of top speed
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Old 01-19-2014, 03:28 PM   #14
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It's not like any SN95 guys on here actually try to hit their top speed... I don't even come close to topping out my car on the road course
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Old 01-19-2014, 03:30 PM   #15
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And with these light back ends your going to need an actual wing for the downforce you need.
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Old 01-19-2014, 03:48 PM   #16
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Lucky me my IRS is heavy enough to help keep it down. I haven't noticed an issue with the rear end getting light so far even when I had the SRA. The Cobra R wing wasn't even functional until 150mph
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Old 01-19-2014, 04:29 PM   #17
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From what i gathered these are the thing i should look into getting.

1. Ford Racing Traction - LOK Limited Slip Differential w/ Carbon Discs - 31 Spline 8.8in
2. Moser 8.8 Axles - 31 Spline 5 Lug
3. Ford Racing 4.10 Gears and Install Kit
4. Ford Racing Speedometer Recalibration Tool
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Old 01-19-2014, 04:36 PM   #18
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I would recommend the bearing kit as well for the gears.
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Old 01-19-2014, 04:42 PM   #19
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i was looking on american muscle and summit, (american muscle was cheaper) and the gears comes with bearings and everything
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Old 01-19-2014, 05:46 PM   #20
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Yea that's going to happen. You trade top speed for acceleration.

Yup there's no way you have enough room for top speed run in the middle if LA lol.

Most I ever got up to was ~120 when I first got my car (took me forever to get there)

Now with 4.10 in my auto I think it's somewhere around 112. But I gets there in a flash

All in all I think it was worth it
People don't expect an automatic to haul *** as much as it does lol


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Old 01-19-2014, 05:52 PM   #21
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Yup there's no way you have enough room for top speed run in the middle if LA lol.

Most I ever got up to was ~120 when I first got my car (took me forever to get there)

Now with 4.10 in my auto I think it's somewhere around 112. But I gets there in a flash

All in all I think it was worth it
People don't expect an automatic to haul *** as much as it does lol


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Mine will do 154 with 3.55s I wonder what it would do with 4.10s?
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Old 01-19-2014, 05:56 PM   #22
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Go fast as ****!!

Doooo it!!!


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Old 01-19-2014, 06:11 PM   #23
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I'll be going from stock everything for the rear to the 31 spline differential and 4.10 gears. Can't wait to feel the difference. I'm tired of having these import things beat me off the line. I do catch them though. But now all they'll see is my @$$

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Old 01-19-2014, 08:44 PM   #24
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Yea that's going to happen. You trade top speed for acceleration.

Well that's good to know!
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Old 01-19-2014, 10:58 PM   #25
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I'll be going from stock everything for the rear to the 31 spline differential and 4.10 gears. Can't wait to feel the difference. I'm tired of having these import things beat me off the line. I do catch them though. But now all they'll see is my @$$

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I kept my 28 spline but just rebuilt it with the CF clutch packs.

I don't do burnouts or anything so I said **** it


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Old 01-19-2014, 11:00 PM   #26
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The 28 spline is actually pretty strong. No need to upgrade unless your a serious drag racer and are running slicks.
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Old 01-20-2014, 12:51 AM   #27
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I have gone 135 in forth with two others to go and I was about 5.5-6k in forth.
I have 3.55s.
I wanna switch to 3.90s.
When am I ever going to go over 150 anyways?
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Old 01-20-2014, 04:58 AM   #28
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NewEdge GTs do not lose top-end with 4.10 final drive gears, in fact all other things being equal they pick up a bit. This is because top speed on a GT is limited by running out of horsepower not rpms; and higher ratio gears will move the engine revs closer to to the engine's peak HP band.

For example, it takes roughly 210 rwHP (attainable from a stock PI 2V) to push a '99 to '04 GT up to 150 mph (click here)--the problem is that at 150 mph with the stock 3.27 gears the engine is only turning 4100 rpm, at which speed the engine can only deliver 170 rwHP¹--only enough to push the car to 140 mph (again see the How Much HP...??? calculator)

However with 4.10 gears the engine will be spinning 5150 rpm at 150 mph, up into the peak HP band, and producing 220 rwHP¹; enough to push the car to a solid 150 mph.


One final comment, based on 50+ years of enjoying speed. Most people have never been in (or on) a vehicle traveling 100 mph, and many of those that claim they have are liars. Push that to 125 mph and probably 1/2 of the people that make such a claim are lying.

You can prove this to yourself next time you are on the highway traveling along at 80 and someone in an Camaro, Challenger, Escalade or Lexus pulls up behind you pretending they want to go fast. Bring the GT up to 120 and watch them fade away as they run out of what my mother called testicular fortitude.

Get up to 150 mph and very few people (regular people, not racers) have actually done it--most making such a claim are liars.


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¹ - Here is a composite dyno chart for my '03 GT, the green lines show the baseline run I made when the engine was dead stock:

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Old 01-20-2014, 05:24 AM   #29
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Rear gears

Never mind figured it out lol
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Old 01-20-2014, 05:30 AM   #30
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Rear gears

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Originally Posted by cliffyk View Post
NewEdge GTs do not lose top-end with 4.10 final drive gears, in fact all other things being equal they pick up a bit. This is because top speed on a GT is limited by running out of horsepower not rpms; and higher ratio gears will move the engine revs closer to to the engine's peak HP band.



For example, it takes roughly 210 rwHP (attainable from a stock PI 2V) to push a '99 to '04 GT up to 150 mph (click here)--the problem is that at 150 mph with the stock 3.27 gears the engine is only turning 4100 rpm, at which speed the engine can only deliver 170 rwHP¹--only enough to push the car to 140 mph (again see the How Much HP...??? calculator)



However with 4.10 gears the engine will be spinning 5150 rpm at 150 mph, up into the peak HP band, and producing 220 rwHP¹; enough to push the car to a solid 150 mph.





One final comment, based on 50+ years of enjoying speed. Most people have never been in (or on) a vehicle traveling 100 mph, and many of those that claim they have are liars. Push that to 125 mph and probably 1/2 of the people that make such a claim are lying.



You can prove this to yourself next time you are on the highway traveling along at 80 and someone in an Camaro, Challenger, Escalade or Lexus pulls up behind you pretending they want to go fast. Bring the GT up to 120 and watch them fade away as they run out of what my mother called testicular fortitude.



Get up to 150 mph and very few people (regular people, not racers) have actually done it--most making such a claim are liars.





------------------------------------------------------------

¹ - Here is a composite dyno chart for my '03 GT, the green lines show the baseline run I made when the engine was dead stock:




Thank god some people are actually paying attention to what's truth in this forum. Top physical speed of 4.10gears is 181 mph or so and you'll need over 550rwhp to get there. I doubt your sixxer will ever get to that power or speed so you will never top these gears out. I really don't like how people say 4.10s make you lose top speed... It's asinine and just wrong for our mustangs. Good post Cliff. I appreciate you!
Thank
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Old 01-20-2014, 05:41 AM   #31
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Thank god some people are actually paying attention to what's truth in this forum. Top physical speed of 4.10gears is 181 mph or so and you'll need over 550rwhp to get there. I doubt your sixxer will ever get to that power or speed so you will never top these gears out. I really don't like how people say 4.10s make you lose top speed... It's asinine and just wrong for our mustangs. Good post Cliff. I appreciate you!
Thank
Don't you know all of these people do top speed runs everyday.

Thank you to both of you as it needed to be said.

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Old 01-20-2014, 08:54 AM   #32
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Don't you know all of these people do top speed runs everyday.

Thank you to both of you as it needed to be said.

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+1 I've only got to 125 and it took awhile to get there ..I'm going to get 3:73 gears when I get paid Wednesday and can't wait ..I don't want 4:10 bc I had them in my foxbody and it just seemed to run to hard going down the interstate
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Old 01-20-2014, 09:22 AM   #33
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+1 I've only got to 125 and it took awhile to get there ..I'm going to get 3:73 gears when I get paid Wednesday and can't wait ..I don't want 4:10 bc I had them in my foxbody and it just seemed to run to hard going down the interstate
I am curious, what are you driving that struggles to get to a buck and a quarter?
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Old 01-20-2014, 11:02 AM   #34
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NewEdge GTs do not lose top-end with 4.10 final drive gears, in fact all other things being equal they pick up a bit. This is because top speed on a GT is limited by running out of horsepower not rpms; and higher ratio gears will move the engine revs closer to to the engine's peak HP band.



For example, it takes roughly 210 rwHP (attainable from a stock PI 2V) to push a '99 to '04 GT up to 150 mph (click here)--the problem is that at 150 mph with the stock 3.27 gears the engine is only turning 4100 rpm, at which speed the engine can only deliver 170 rwHP¹--only enough to push the car to 140 mph (again see the How Much HP...??? calculator)



However with 4.10 gears the engine will be spinning 5150 rpm at 150 mph, up into the peak HP band, and producing 220 rwHP¹; enough to push the car to a solid 150 mph.





One final comment, based on 50+ years of enjoying speed. Most people have never been in (or on) a vehicle traveling 100 mph, and many of those that claim they have are liars. Push that to 125 mph and probably 1/2 of the people that make such a claim are lying.



You can prove this to yourself next time you are on the highway traveling along at 80 and someone in an Camaro, Challenger, Escalade or Lexus pulls up behind you pretending they want to go fast. Bring the GT up to 120 and watch them fade away as they run out of what my mother called testicular fortitude.



Get up to 150 mph and very few people (regular people, not racers) have actually done it--most making such a claim are liars.





------------------------------------------------------------

¹ - Here is a composite dyno chart for my '03 GT, the green lines show the baseline run I made when the engine was dead stock:




Than why is it that I'm hitting the rev limiter at like 112?
Does that mean I have and extra gear to go? Cuz I tried to keep going but it wouldn't shift It just kept going into the redline so I let off (auto)


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Old 01-20-2014, 11:05 AM   #35
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Than why is it that I'm hitting the rev limiter at like 112?
Does that mean I have and extra gear to go? Cuz I tried to keep going but it wouldn't shift It just kept going into the redline so I let off (auto)


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Sounds like you still have a governed car. Which isn't a bad thing.
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