Specifically on the MT, 1st gen Sedan. If so, what did you go with and what are your opinions? Is the 3.7 FD from the 07+ worth it considering the M/T is already 3.59?

 

is this possible in the X?

 

The X has the same final drive as the 6MT from what I have read.

You'd need to change front and rear final drives just as you would in a 4x4 truck. Unsure if there are any ratios available but then it would also require a calibration to correct the speedometer.

 

my350z has a lot of information on this so I would search there.

 

I don't want to change my pumpkin, I just want a taller 6th gear and to take the speed limiter off.

 

The stock one can reach at least 200mph with an 8k RPM redline so I would keep it.

 

I want a taller 6th for better economy. You can run almost as fast in 5th as you can in 6th. I had a 2004 Pontiact Grand Prix and 70 mph it was turning 1900 rpm. The G is doing amost 3000.

 

actually the x has 3.3 front fd and 3.5 rear fd. As long as you keep the same ratio difference, I think you would be fine. 3.5 front and 3.7 rear.

So no one has done this in the sedan?

 

I think the idea of using a higher gear on the final drive, turns some people away because that means the already high RPM for any given speed, will be even higher. And using a lower gear means that you'd lose the "implied torque" that we get from revving high and using higher gears...

 

You would lose a lot of acceleration time and torque.

 

That was one of the first things i noticed about the G that i didn't like. I do a lot of highway driving at around 80MPH. That;s about 3000RPM for me. I just hate driving 100 miles at a time at that RPM.

My previous Mustang GT used to cruise at 1900RPM in 5th gear at 80MPH..and get 26-27MPG doing it at the same time.

But i guess it will be fine since 3000RPM is not that excessive

 

3,000RPM is nothing with a redline lose to 7000RPM. What did the Mustang top out at? 6000RPM?

 

Pushrod engines are differnet than our higher reving DOHC engine. Those pushrod engines in a Grand Prix has its peak torque output at a very low RPM, as opposed to our mid-high RPM peak torque output. Those cars have also have very tall gearing, you could prob do 60mph in 1st gear in the mentioned Grand Prix. They put the tall gears to improve gas mileage by taking advantage of the low end torque. But the disadvantage here is the high RPM power is sacrificed.

 

Not at all, you can do over 120mph in 5th alone. Just changing the last gear wouldn't affect that. How many times have you raced someone all the way to the top of 6th gear?

 

Actually my Mustang was a SOHC engine. Redline was 6000RPM. It was a very "importish" motor in the regard it had crap for torque under 2500RPM. If you were going to jump on it, you had to make sure you were at 3000RPM or higher in order for the car to pull. And it would pull hard to redline. It was not like a typical pushrod motor where all it's torque and power were down low. The 4.6L loves to rev and it pulls the hardest at the upper end of the RPM range. I used to hate letting off the gas to shift because the car was pulling so hard near redline.


I'm not trying to compare the motors at all. Wasn't the point of the post. I was just saying it was odd to me how high the car revved at cruising speed on the highway with a 5-spd auto. But then again, i wasn't worried about high RPM's either. I'm sure the car/motor was well engineered for it