4.10s or 3.73s?

[Lethal302]

Considering putting gears in my otherwise stock 13. I daily drive it, but only about 15 miles a day. The car will see a little time at the 1/4, but other than that I'm just looking for a little seat of the pants feel. Do you guys suggest 3.73s or 4.10s? What RPM range would I be at with 4.10s in 6th around 80mph?

Also, do I need to pick up an sct/ngauge or can a Ford dealer recalibrate my speedometer?

 

[railroad]

For your driving habits 3.73s and you will need to do your own calibrating.

 

[99VERT]

I just put in 4.10s and 2000 RPMs at 80MPH on the highway. You will be rowing the gears alot with the 4.10s but they really wake up the off boost cruising of the car. Mine is a weekend warrior so the extra shifting doesn't bother me.

 

[Softballer77]

With my FRPP 4.10s I was about 1950 at 80mph. (there are a few calculators out there if you want to play with different gear ratios).

General rule of thumb is under 800rwhp, 4.10s. Over 800rwhp, 3.73s. At 710 to the rear in mine I was right at about 7k rpm going through the traps at 134 and the 4.10s.

I have gone off the beaten usual path and just installed 3.90s for an in-between, but when i first put my 4.10s in after being used to 3.31s...WOW. Viscious.

 

[Black Thunder 715]

For your driving habits 3.73s and you will need to do your own calibrating.

I agree with 3.73s for daily driving. And the Ford dealer will claim that they have no way of re-calibrating the speedo.

 

[dale.baker]

4:11's all the way. Had 3:70's for 20 miles and took them out. Car is much more fun to drive and as others have said you can actually use 6th gear without putting excess strain on the clutch. JMHO.

 

[railroad]

I do not think you will regret either gear. I shift 2nd to 4th with the 3.73s street driving and never lug the engine.

 

[Cman01]

Split it down the middle..................do 3:90's. That's the gear ratio that I plan on doing on mine when the time comes for a gear swap.

Tony

 

[07 Black Beauty]

Split it down the middle..................do 3:90's. That's the gear ratio that I plan on doing on mine when the time comes for a gear swap.

Tony

Ford Racing doesn't make a 3.90 though do they? I know motive does but I've heard they can be noisier then the Ford stuff.

 

[Mainn]

Ford Racing doesn't make a 3.90 though do they? I know motive does but I've heard they can be noisier then the Ford stuff.

No they don't - stick with Ford Racing.

FWIW, I'd recommend 3.73 gears.

 

[Softballer77]

Ford Racing doesn't make a 3.90 though do they? I know motive does but I've heard they can be noisier then the Ford stuff.

Ford Racing does not make 3.90s. It's known FRPP makes a better product, but the Motives (4.10s) I had in my other mustang were always quiet. The FRPP 4.10s I put in my current Shelby were whining like a 4year old after a day at the track. I did just pull the 4.10s and put Motive 3.90s in my Shelby recently and they are quiet so far.

I've had nothing but good luck with Motives, but only time will tell.

 

[paluka21]

You're going to get a lot of different opinions, but in the end either gear will make a substantial difference in how the car feels, and its really driver preference. For me, I went with a 3.73 as I'm not much of a drag racer these days but know the 4.10 would be more suitable for 1/4 mile drag racing.
I personally enjoy a little more elongated gear, but a 3.55 is just too close to the factory 3.31 ratio for my tastes and a 4.10 was just a little too short for the purposes I use my car for. ( Mostly cruising )