Blacksmoke

Funny thing.
When I installed 4.10's from 3.55's I actually had an improvement in traction.
I would slide like a **** on launch with the 3.55's but I think the 4.10's helped me
to "dig in" more and it was actually easier to launch with them.

They also helped to make my wheel hop go away.

HoboDxb

What if it was an auto transmission? Still a decrease?

Blacksmoke

I think 4.10's will help anyone as long as the person can launch good, period.

The driver can make almost any performace mod a bad thing
if he does not know how to control the car.

But you are going to pull harder with 4.10's regardless of being manual or auto.
Changing the gear ratio like this will help you get to your speed "quicker" than you
would with the 3.55's or whatever.

JIM5.0

The reason why the 2011 6R80 trannies come with 3.15 rear gears is because it all has to do with gear multiplication.

For your car, if you have a manual, I believe you should have a TR3650.
I think you have a 1st gear ratio of only 3.38:1.
With your rear gear of 3.55:1, your final gear ratio in 1st gear at the line is about 12.00:1

The 6R80 trannies in '11 'Stangs have a very deep first gear.
I think the 6R80 1st gear is 4.17:1
With a 3.15 rear gear ratio, the final gear ratio in 1st gear at the line is about 13.16:1!

So, even if you have a deeper stock 3.55:1 rear gear vs the 6R80's 3
15:1, the '11 6R80's final 1st gear ratio of 13.16 is better than your 12.00.


Now, if you go to 4.10:1 rear gears, your new 1st gear final gear ratio at the line will be approximately 13.86.

However, the 6R80 with 4.10 rear gear will have a final gear ratio at the line of 17.10. But you had better get yourself some sticky *** tires, because you are going to peal out like crazy!

Norm Peterson

Might be a closer call than you think.

It will require you to develop more skill in launching, so that you won't put yourself into excessive wheelspin or wheel hop, either of which will trash your 0 - 60 times.

With 4.10's and a 2.00 second gear in the 3650 manual tranny, 60 mph will put you slightly past 6300 rpm (don't bother using any of the online gear & speed calculators to check this - none of them are accurate enough because they all overlook one 3%-ish tire effect that really matters here). Depending on exactly what the power curve looks like on the far side of 6000 rpm, the last 3 or 4 mph might come up more slowly than you're hoping for. Whether an upshift to 3rd would help or hurt depends on several things but would probably hurt.

With the 5R55S automatic, you'll be in third at about 50 mph.

Your question is a very good example of what can happen when there is too much focus on the numbers without knowing what's behind them.

4.10's are certainly going to be more responsive overall, assuming that you stay in each gear to the same road speed as you do now. Or, they'll let you upshift a little sooner when you aren't "playing". For most people, this is the bottom line. Really, zero to 60 is little more than somebody's opinion of how acceleration should be measured and compared, just like the quarter mile was kind of a consensus for that activity. Maybe it's the "zero to 55 mph" time that really matters to you, which becomes a clearer argument for 4.10's.


Norm

pdonket

I think fuel efficiency is another thing to note for this they don't acheive those pretty fuel consumption numbers with 4.10 gears lol

riskyfool

I have heard SO many people say that mpg can improve with 4.10s in city driving. That may be so but I get a considerable amount less mpg with my 4.10s than the 3.55s. But I also don't give a **** about that! I didn't get the gears or the car for good gas mileage.

pdonket

Technically it could, but I think what many don't take into consideration is that people who upgrade their gears tend to enjoy more spirited driving than those who don't.

Additionally, you should see that your MPG will sink as your gear ratio increases. And as many others would agree, yeah we don't buy our mustangs or gears for the fuel economy

alkemist

Stock Pirelli's on a 06 GT is 235.

If I really romp on the gas with TC off, I will spin but will grab traction right away. I have 285's, so you will want to consider tires that can grip. I don't accelerate hard off the line on the street often, I don't like to be perceived as a douche.

outceltj

When i first installed my 410's i took a trip to atlanta from indianapolis and i was getting 24. I hand calcualted the mpg. I drove there with the thought process of getting the best mpg i could. There was NO spirited driving. People say that ur gas mileage falls off with 410's and it does b/c when people get them installed what do they do? Have fun.

But since i have installed cams my mpg has dropped off considerably. ON the road i get maybe 20. Oh well its fun