Gear choices>>>>>>

**LXguy88** · 03-03-2008, 09:27 PM

Thinking of gears for the 04. Its a 5 speed. I'm considering 3.90's because I do alot of highway driving and I believe 4.10's are to high and that 3.73's are to low. Any thoughts? thanks

**Troll** · 03-03-2008, 09:30 PM

sounds like you got it all figured out.

EDIT: I had 4.10 in my PI-swapped '97 and I got 3.73 in this '01. Your assumptions are correct, IMO.

3.90 seems like the best gear for the 4.6, but Ford doesn't make that gear. So, it's a little bit more work to install a 3.90. Most mechanics will charge you more to put a Motive or Richmond gear in than a Ford gear. Maybe they can elaborate.

**Cam99** · 03-03-2008, 09:48 PM

Stay FRPP and go 4.10's.

**scott5** · 03-03-2008, 09:56 PM

i say 3.73s if you do ALOT of highway driving but if its only a couple times i say 4.10s

or if your a real man go 4.33s hahah JK

**Troll** · 03-03-2008, 10:48 PM

4.10's don't give you much room for improvement in the 1/4 unless you want to shift to 5th. 4th tops out about 108mph.

I don't know about 3,90s, but these 3.73 will do about 125 just over 6K rpms in 4th. If you like to "air" it out every once in a while without shifting into that 747 overdrive, do the 3.73.

I got 23.9MPG coming back from Carlisle today with the 3.73.

**Cam99** · 03-03-2008, 11:21 PM

Originally Posted by Troll

4.10's don't give you much room for improvement in the 1/4 unless you want to shift to 5th. 4th tops out about 108mph.

Wow, that kind of sucks. My mach with the 4.10's was good to about 122-125 before topping out 4th. That was just about perfect.

**LXguy88** · 03-03-2008, 11:52 PM

My brother runs motives with no problems. The fox has ford gears but the damn thing is not running yet. 4.10's just seem to high. 3.73 just seem to low for a SOHC engine. RPM's and all. I'll be doing the gears just like my fox.

**Troll** · 03-04-2008, 12:27 AM

Originally Posted by Cam99

Wow, that kind of sucks. My mach with the 4.10's was good to about 122-125 before topping out 4th. That was just about perfect.

6,800 redline? If you removed the rev-limiter on the 2v, you might be able to get 110-112? at 6,200. there are calculators somewhere on the innanet, but I'm too lazy to look right now.

**Pure Stock** · 03-04-2008, 12:35 AM

Let me clear up the murky water here.

With 4.10's in 4th (1:1) with a tire that is 26" tall 117 MPH can be achieved with an rpm of 6,199 rpm.;)

**Troll** · 03-04-2008, 12:43 AM

Originally Posted by Pure Stock

Let me clear up the murky water here.

With 4.10's in 4th (1:1) with a tire that is 26" tall 117 MPH can be achieved with an rpm of 6,199 rpm.;)

EDIT: from my own personal experience and maybe the tach or speedo was off? At just over 6,000RPM in 4th the speedo was 108-110mph.

**Pure Stock** · 03-04-2008, 12:49 AM

One I use @ the track. Here's another one that close as well from the corral.
http://www.corral.net/tech/

**LXguy88** · 03-04-2008, 12:58 AM

top speed. I don't think we're all on the same page. I want a top speed of over 120 but am not doing 3k at 80.

**Cam99** · 03-04-2008, 08:09 AM

Originally Posted by Troll

6,800 redline? If you removed the rev-limiter on the 2v, you might be able to get 110-112? at 6,200. there are calculators somewhere on the innanet, but I'm too lazy to look right now.

That was about my top of forth, so it would be about 6800-6900 rpm's. I believe fuel cut out was 7000.