Would someone be able to take a video of themselves revving your stang(focusing on the RPMs) with the 4.10s, or show me going WOT through the gears? I'm trying to see how much more shifting is required. My stang is a "daily driver" and I'll be driving her 45 min one way to work....but it is all highway. Wondering if this would be a good idea or bad. Thanks!

 

if your all highway id stay with the 3.55 especially if gas is a concern. if its not the 4.10s are great. just expect to use more gas on the highway. 70mph is around 2500 rpms i believe

 

Would my money better better worth it towards a 1 pc Alum DS?

 

Are you planning on drag racing? if not a driveshaft wont do much for you. yes it frees up weight and rotational mass. it wont give you any seat ofthe pants feeling. the gears will. it depends on what your trying to do to the car? what mods do you currently have?

i would personally go with an intake and a tune if i were you. best bang for the buck

 

Tuner and cold air first and gears second.

 

4.10's with my automatic transmission, I'm in 5th gear at about 40mph (1500RPM or so, I forget) in normal traffic (hardly any throttle). So, thats roughtly a shift every 10 mph or so. Now, thats under a very light throttle, RPMs not getting very much over 2000 in each gear.

 

I don't know if you have a tuner or not but you can change your shift points on the auto with your tuner.

 

Well I'm planning on getting a C & L intake with Evolution Performance tune this spring(when I have the money) I want to get another mod while im getting that done. No I don't go to the strip ever....but I have thought about it.

"4.10's with my automatic transmission, I'm in 5th gear at about 40mph (1500RPM or so, I forget) in normal traffic (hardly any throttle). So, thats roughtly a shift every 10 mph or so. Now, thats under a very light throttle, RPMs not getting very much over 2000 in each gear."

That's how I shift right now at those points under light throttle....I thought with 4.10s you have to shift alot quicker cuz the bigger gears allow you to rev faster?

And how much gas mileage do I lose with the 4.10s? How does it effect the driving when you're just cruising on the highway? Does the car jerk forward at the lightest touch of the pedal?

 

I lost about 2mpg in town, and about 3-4mpg on long trips (doing 80mph, which now puts me at 3000 RPM) It doesn't jerk forward or anything, just bangs through the gears alot quicker. I really enjoy it, but it's my weekend car, I walk to work. I donno if I'd like it with a manual, that would be quite a bit more shifting.

 

most people Ive heard from that have done the 4.10 swap say they actually improved their mpg around down slightly, but lost it on the highway.

 

I also got exhaust at the same time, so I put my foot into it quite a bit more now

probably not a fair comparison, I know.

 

Not trying to be a red arze or anything. But there is NO WAY 4:10 gears will improve MPG under any circumstances. Really, not trying to be a butt. BUT NO WAY!!!!!!!!!!! Think about it.
Scott

 

You are wrong. At my police station we drive Crown Vics, and on several of them we ordered them with the optional 3.55 limited slip rear end, and several others were ordered with the 3.27 non limited slip. The 3.55's get about 1.5mpg better in the city driving, but about 2-3mpg worse on the highway. This is all averaged out over 15-20K miles on each car. We did a fuel useage comparison a few months ago and it was interesting. Driver differences did not play a factor either, since the cars are all shared, and driven by different people on different shifts, i.e. nobody has their "own" car.

It makes sense to me, the engine is working a lot less to move the car with the bigger gears, and that shows up as mpg increase in the city. On the highway, the engine is revving higher with the big gears, and uses more fuel.

 

100% correct

 

I just got back from a road trip and there were lots of twisties and uphills. I got 21.29 which is the best mileage I have ever gotten since DAY 1.

 

Steve,
While I can not speak about how a police car is driven and the gas mileage they can get in the city I can speak about putting 4:10's in a daily driven mustang. I have modified 3 stangs with 4:10's and in all cases they lost 2-3 mpg driven normally. I live in the corn fields of southwest Ohio where most of the time you can run at least 55 mph. Under these conditions I can assure you that you WILL lose mpg.
Scott

 

I agree with you that under highway conditions you will lose mpg...see my first post. I stated that the police cars got worse mpg on the highway with the bigger gears, but better mpg in the city. You are describing mostly highway driving, so of course you will lose mpg.

I was merely stating that you were incorrect when you said the following There ARE circumstances where bigger gears can actually get better mpg's....city style driving, ie mostly under 55mph, which many people do in their daily drivers, not just police cars.

 

No videos yet?
A before after video would be sweet.

 

A video of reving will show no difference. Going through the gears you will notice slightly quicker shift point but it's not a huge difference. I have 4.10s and I drive 1/2 hour on the highway each way to work. It's really not an issue, especially after adding underdrive pulleys which help gas mileage.
You should get an intake and tuner first. That way you will have the tuner so you can recalibrate your speedometer.
With all of my mods, shown in my signature, I get 24mpg highway. Not bad.

 

off topic but did the UDP affect your A/C Temp? Does it still blow ice cold?