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  Topic Review (Newest First)
June 21st, 2019 11:38 AM
Dunmaghlas
Quote:
Originally Posted by ZEN357 View Post
This is from another forum by someone who changed out their 3.73's to 4.10's in there Mustang. Hope this gives you an idea of what you may be looking at, sorry I couldn't be of more help.

This is a completely unbiased opinion. The reason I say this is because after I killed my other rear end with 3.73s I did a rear end swap (entire rear end). I was supposed to get 3.73 gears from FRPP and apparently they installed 4.10s. Everything on the box said 3.73's including the shipping documentation. I didn't find out until after 2 months of driving the car (which would be today) that it actually has 4.10s. It's like thinking you are about to drink water and it turns out to be a Sprite and all you taste is the soda.

Here are the thoughts and questions I kept asking myself because it didn't seem "normal" compared to my old 3.73's I had. So if you want to know the differences...here ya go.

1. Why am I getting out of 1st gear so quick? These 4.10's rev a lot quicker.

2. I think I'll shift at 2k to save gas. Why am I doing 40 MPH and in 5th gear already? I have to shift at 3k to keep the momentum up with "traffic" and hit 5th pretty quick.

3. Why is my gas mileage so bad? I went from 23-24 MPG on the highway to 20-21 MPG highway. 18 when you mix in traffic.

4. Why is my RPM so high in 5th at 70 MPH? With 3.73's I was about 2200 or so and with these 4.10's I'm at 2500.

5. I'm so glad I got rid of those 3.27 gears I had. I can pass cars so much easier in 5th gear without downshifting. Fact is you can pass cars without downshifting with 3.73's too....it's just easier with 4.10's since you're almost to 3k on the highway!

6. Why are my tires spinning? They never used to spin like this before.

Those are all I can remember for now. One issue I did take note on after figuring out I had 4.10's was my SpeedCal. I have it set for 3.73 gears, not 4.10s and my speedo is only 2 MPH less than my GPS
No, that was plenty of help, thank you.
June 20th, 2019 10:38 AM
ZEN357 This is from another forum by someone who changed out their 3.73's to 4.10's in there Mustang. Hope this gives you an idea of what you may be looking at, sorry I couldn't be of more help.

This is a completely unbiased opinion. The reason I say this is because after I killed my other rear end with 3.73s I did a rear end swap (entire rear end). I was supposed to get 3.73 gears from FRPP and apparently they installed 4.10s. Everything on the box said 3.73's including the shipping documentation. I didn't find out until after 2 months of driving the car (which would be today) that it actually has 4.10s. It's like thinking you are about to drink water and it turns out to be a Sprite and all you taste is the soda.

Here are the thoughts and questions I kept asking myself because it didn't seem "normal" compared to my old 3.73's I had. So if you want to know the differences...here ya go.

1. Why am I getting out of 1st gear so quick? These 4.10's rev a lot quicker.

2. I think I'll shift at 2k to save gas. Why am I doing 40 MPH and in 5th gear already? I have to shift at 3k to keep the momentum up with "traffic" and hit 5th pretty quick.

3. Why is my gas mileage so bad? I went from 23-24 MPG on the highway to 20-21 MPG highway. 18 when you mix in traffic.

4. Why is my RPM so high in 5th at 70 MPH? With 3.73's I was about 2200 or so and with these 4.10's I'm at 2500.

5. I'm so glad I got rid of those 3.27 gears I had. I can pass cars so much easier in 5th gear without downshifting. Fact is you can pass cars without downshifting with 3.73's too....it's just easier with 4.10's since you're almost to 3k on the highway!

6. Why are my tires spinning? They never used to spin like this before.

Those are all I can remember for now. One issue I did take note on after figuring out I had 4.10's was my SpeedCal. I have it set for 3.73 gears, not 4.10s and my speedo is only 2 MPH less than my GPS
June 19th, 2019 12:15 PM
Dunmaghlas
Quote:
Originally Posted by ZEN357 View Post
Acceleration will be quicker. Gas Mileage will decrease. Overall cruising RPMs will be higher on the highway.
Yes, but do you know any specifics? I know that a lower gear will accelerate quicker but I don't know the difference, I just see people arguing over the two gears with no real explanation.
June 19th, 2019 10:47 AM
ZEN357 Acceleration will be quicker. Gas Mileage will decrease. Overall cruising RPMs will be higher on the highway.
June 18th, 2019 09:39 PM
Dunmaghlas
Difference between 3.73 and 4.10 gears?

Hey guys, just wanted to clear up some confusion of mine, what exactly will the difference between these gears be in a 2003 V6 3.8L Stang? - 3.73 and 4.10 - Specifically, what is the difference in acceleration and mpg? Consider that this would be the first add-on on a bone-stock drivetrain. Also, how much quicker would a 5.13 accelerate?

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