Something to remember in this discussion...

'05 tire diameter is 2" taller than the SN95 (27.5" vs. 25.5"). The 3.55 gear in a manual GT is equivalent to...

25.5/27.5 X 3.55 = 3.29

in the '04 SN95. Putting a 4.30 gear in the '05 GT would be like a 3.99 final drive in the '04. I'd be putting a 4.30 or even a 4.56 in my GT.

 

Another thing to remember in this discussion is that you cannot really compare the new modular 3V to the 2V pushrod engine.

They are both 4.6Ls, but they are different animals. Pushrod engines have more down-low torque, and modulars need to be revved more to get the torque. However, the modulars have more power once they do get revved more.

That is how Ford got 40 more hp out of this engine. So, for those saying "my pre-05 GT drives like this or that" it isn't really a valid comparison. Just look at the difference in the dyno charts between the two...

 

Say what? :scratch:

Welcome to 1996, ALL 4.6L V8s are Modular V8s and ALL are OHC, 2V, 3V & 4V.
:crazy:

 

Thanks for all the info. It is nice to see some other people who know what they are talking about. It gets so silly on some of the threads, I can't take it.

 

Big-D,
I would agree with you for street racing but not for drag racing. You need to remember that the tire diameter for a typical drag radial (Nitto 275/40R17) is only 25.6 inches. Running those with 4.30 gears would result in 4th gear at 6,000 rpm being 103 mph. Doesn't give much room at the top end. I think I'll go with 4.10's which will give me a few mph to grow into at the track (108 mph at 6,000 rpm).

The Boss Hog (just my opinion . . . . . )

 

Has a programmer or speedo chip been made to make this all possible?
I LOVE the fact it has take all of about 2 days for everyone to want to mod out there new 05s. Bless you all!

 

Well I think I am going to go with the 4.10 eventually. I have been researching shift points and people have reported that you should shift at around 5600 when racing. I feel that you will have to shift into 4th no matter what to get the best ET and traps. It seems like the 05 GT is choking up top for some reason, since the traps are lower than I expected. Maybe this will change soon when people test Cold Air Intakes and catless x-pipes.

 

4.56s would be just right with a 28" tall slick, my tire of choice!

 

can you explain to me what this 'split' between 1st and 2nd is? do you mean the shifter throw space, ie how far it is to shift from 1st to 2nd?

 

can you explain to me what this 'split' between 1st and 2nd is? do you mean the shifter throw space, ie how far it is to shift from 1st to 2nd?[/b][/quote]
No, it is the gear reduction ratio difference between the gears. The 1,2,3 gear ratios are much closer together in the automatic than the 1,2,3 gear ratios in the manual. Which means you drop less RPM during the 1-2 and the 2-3 shifts in the auto than you do in the manual.

The Boss Hog

 

Is anyone making any gears for it yet? Also, what would any of you recommend for a daily driver? 3.90 or 4.10?

 

I thought the rearend was carried over from the previous years? If so then the gears for the 8.8 would already be out.

 

I just got back from the shop where I had 4.10 installed on my 2005 GT / Auto. It made a huge performance gain as well as off the line performance.

 

I'm pretty sure it has the same 8.8" rear end, but I wanted to confirm they would work.

 

OK, details, details. How much did it cost? Did you have to have your computer reprogramed for the correct speed? Did it confuse your auto into shifting at the wrong rpm? Can you quantify how much of an inprovement it was? How does it fell at highway speeds? details, details

The Boss Hog

 

Most newly designed Ford's use a wheel sensor (RR) for driving the odometer. This means that when you change gears, the odometer STILL reads the CORRECT speed. It also means that your speedometer and odometer read positive when you are going in reverse.

At what RPM does the trannie shift is another good question. It will depend if the trannie shifting is primarily driven by engine RPM or road speed (along with engine load).

 

I agree. My '93 F150 read correctly after changing the gears. But, several people on this forum and on the '94 to '04 V8 forum have said you need to reprogram the computer. I'm just trying to get the straight story

The Boss Hog

 

I agree. My '93 F150 read correctly after changing the gears. But, several people on this forum and on the '94 to '04 V8 forum have said you need to reprogram the computer. I'm just trying to get the straight story

The Boss Hog [/b][/quote]
The 99 - 04 Stangs are based on an old platform, so a lot of things in them go back many years. The speedomoeter is one of them. Its sensor is on the trannie so you need to correct it if you change gears. But they do use an electronic sensor. A couple different companies make electronic "corrector" adapters.

Since the '05 Stang is all new and steals a lot of its electronics from the Lincoln LS, my guess is that it uses the new system with the wheel sensor, so the speedometer will not neet to be corrected when you change gears.

 

My 4.10's made a huge improvement....I' running right about 2600rpm at 75......Pulls like a jet and the Bassani's sound awesome. I'm sure the x-pipe's not hurting things either.....Outside of Bryan's '05, there's nothing in this town that'll hang with mine when it comes to '05's.....You won't be disspaointed with the 4.10's.....I was out the door for 515.00 with parts and labor so it was fairly economical for the performance it gave. Sure did wake the car up in a hurry!