What gear upgrade for 06 Mustang GT?

[Sonic Blue GT]

I am considering upgrading my gears from 3.55 to either 3.90 or 4.10.

1. Which would you do?

2. Is there a speedo gear I must get as well or can the speedo be set using a programmer going through the ECU?

3. I know I will gain low end rear-wheel torque but how will my RWHP dyno curve be impacted or won't it?

 

[Motorhead6T5]

I am considering upgrading my gears from 3.55 to either 3.90 or 4.10.

1. Which would you do?

2. Is there a speedo gear I must get as well or can the speedo be set using a programmer going through the ECU?

3. I know I will gain low end rear-wheel torque but how will my RWHP dyno curve be impacted or won't it?

1. Depends on tire diameter,most go with 4.10's and love em.

2. You can adjust it with a programmer

3. It would read a bit different cause the gearing.

 

[Red Turtle]

4.10's here as well.

 

[freebass55]

3.90's here. Only had them for a week now, and no track time. You can really tell the difference, though.

 

[Red Turtle]

I probably would have gone with 3.90's if FRPP made them, but they don't. That is why I went 4.10's.

 

[42RCODE]

Go 4.10's you won't be disappointed. Then buy a hand held tunner ( SCT 2 )
and correct yuour speedo. :thumbsup:

Fred :beer:

 

[nbk13nw]

Went with FRPP 4:10's and a TA Girdle while I was down there... Hope to have them in next month

 

[WPGFORDGUY]

4.10s

 

[J666Z]

I probably would have gone with 3.90's if FRPP made them, but they don't. That is why I went 4.10's.

funny you say that... Motive makes FRPP gears now. So FRPP maight be coming out with the 3.90

 

[Impact 5.0]

Auto with 4.10's and love them

 

[J666Z]

Auto with 4.10's and love them

those autos are badass!!!!

 

[Screamin Cobra]

A buddy of mine is running 4.10's in his GT and that gear kicks ASS...thought I might add that. :rockon:

 

[HotRodHarry]

4.10's are great in the manual trans cars!!....but when I put 4.10s in my automatic 06 GT Convertible I had..to me..it was too much...going through the torque band too fast with the low 1st and 2nd gears....3.73's or at the most 3.90's in Automatics. Thats just my opinion though

 

[J666Z]

4.10s FTW!!!!

 

[S197 Devil]

I would do 3.73's not many can hook with 4.10's in the back.

 

[redfire03 svt]

4:30's here and love it.

 

[Angel]

I would do 3.73's not many can hook with 4.10's in the back.

This appears to be an issue with the S197 Manuals and the 4.10s are good for the launch in the Auto. With the new option of the limited slip differential in the 07 Autos, it is making for better extension through the 1 and 2 gears.

 

[Nickoli]

i'm waiting to finish my turbo first then i'm going to try to figure out what i need then but before i decided to go turbo i was going to go w/ 3.90s

 

[californiacuda]

Question, when the hp has been substantially increased (with a KB for example), do the tires get way too overpowered by 4.10's gearing?

With additional power, do you need taller gears?