Alright so I've been looking at this for awhile

http://www.americanmuscle.com/xcal2-...r-oil-kit.html

I've heard the MPG loss is rather low, maybe 1-3 MPG which wouldn't bother me considering the power I'd be getting, but outside of replacing some belts and changing alternators and such I've never done anything with gears before on a car. Is there anything else I should know before I do the swap? Also outside of the lower MPG and more wear on the tires if there anything else I should know before doing a swap? I still got a few years left of payments on this car.

 

Don't do gears yourself I'm not knocking your ability but from what I have heard it's a job you want done by someone who has done it before.

 

Power adder section is for questions on Blowers,Turbos,Nitrous only moving to general tech.........

Also you do not have the know how to do a gear install from what you said. Its a little more complicated then doing an alternator change.

 

I lost like 1mpg with my gear swap and that was only because it was right after I got them installed and I couldn't keep my foot out of it. Now that I'm more used to them, I will say that I've only lost maybe 1/2 mpg and I've had my 4.10's for about 5,000 miles now.

You will not gain any power from a gear swap.

Also, do not do the install yourself. Pay someone to do it for you. Gear swaps have to be extremely accurate or you could potentially have problems either right away or in the future. If you want it done right, don't do it yourself.

You'll need gear oil, friction modifier, obviously the gears, and a tuner to correct your speedometer.

 

What year is your car?

 

Well I do know that it doesn't add power to the per se, but if my understanding is correct it is changing how much power is going to the rear wheels correct?

Yeah I was pretty sure I wouldn't be able to do it myself, I'd rather not take it to a Ford dealership because the only ones near by are far from reputable, Ford actually stopped doing business with one of them if that says anything, also dealership prices for work are already outrageous. Anyone got any guesses on how much it may cost me to do the switch?

 

My car is a '07 and its a V6

 

it just make you accelerate faster but ur HP doesnt change at alll

 

It doesn't change how much power goes to the rear wheels. It that was the case, you would either gain or lose power from a gear swap. They will only change how quickly you accelerate.

From ehow.com's website:

"Differential gears come in a variety of sizes and gear ratios. The different gear ratios are what determine how easily or how fast the rear wheels spin. Just like the gears on a bicycle affect how easy or difficult it is to pedal, the gears in a differential gear determine the ease to which the rear wheels spin."

Call around and get estimates before deciding on a place. One Ford dealer that I called wanted to charge me upwards of $700 for labor alone and the other Ford dealership I settled on is very reputable and they charged me $528 and that was just for the labor and friction modifier. I supplied the gears and the gear oil.

 

You might also want to think about getting a rear end rebuilt kit also. When I got gears installed in my 03 GT they charged about $250 for labor. Dont bring it to a dealership.

 

Don't fear the gear.

 

except for you swervy.....hahahahahahaha your turbo's wont take nicely to the 4.10s

 

okay i have never changed gears for a mustang, but if they are similar to a chevy rear end, its not too too too terribly complicated. you just ahve to know what you are doing a little bit to do em properly.... the hardest part is the shim them properly (you need to be exact on this part)

 

You wont be disappointed with the gears just have them installed by someone who knows what theyre doing. Then sit back and hold on.........

 

If you do any amount of highway driving, do not go with 4.10s. I absolutely cannot even go above 65 on the highway without being at 3k and getting a headache.

I gained MPG in the city, however. I never drive the car, so its okay.

 

Maybe if you're an auto. With a stick i'm at 75mph at 2600rpms. 80mph at 2800rpms. If you don't drive long distances on the highway 4.10's are perfectly fine. I gained 1.5mpg on the street.

 

4.10's are fine on the highway and the interstate. I have an automatic and I'm at 2800-3000 at 80mph. I drive to Orlando and back when I meet up with the forum guys and my 4.10's are awesome on I4. They give you that extra 'oomph' you need to pass someone who is going slow.

 

i had 4.10s in my v6 that I installed myself with a friend, liked them alot. After doing it once and getting slathered in gear oil (stuff is toxic and smells like ****), if i ever get gears again, i would just pay someone to do it. But if you want to save some money and do it yourself, its not really rocket science to install a set of gears. Give yourself a weekend, get the right tools, Take your time, and do it right. Here's a little how-to.

http://www.corral.net/tech/drivetrain/gears.html

 

Hell yes, it does. My fiance told me it smelled like death, but I didn't believe him. Once I smelled it, it literally wouldn't leave my nostrils. Definitely one of the worst things I've ever had the mispleasure of smelling. God, just thinking about it made me make a disgusted face.

 

true, the turbos dont like 4.10s, that's why I had to go back down to 3.55s after the turbos were installed. When I was N/A, I loved them.

 

i gained mpg with mine

 

ANYWAY........you going with the swap after reading all the info? Or maybe going with different size gears?

 

Put the 4:10 gears in and you will never regret it. Add a turbo and you will eat GT's for lunch!

 

My 4:10s actually help my turbo spool faster and therefore get me into boost faster. Boost is good!

 

Don't let anyone talk you out of the 4.10's unless you're going to add some crazy power adder later. I've had mine for probably 1000 miles now and mpg has not changed. It was down the first tank because I was having fun but this car is my dd to and from work 25 miles each way mostly highway (about 80/20 split). As long as you're not going to be doing 75+ constantly and you keep it at 65-70 you won't loose much mpg if any.

You could take it to Ford but I'm sure they will charge you close to double what a local speed shop will. Although if the speed shot has not done many mustang gear swaps then I would be hesitant. My buddy did mine...he had an extra rear end so we were able to do it at the shop he works at so he could use their press to get the bearing off/on the pinion. Then it was just a simple swap of rears once we got home.

 

The 8.8 is actually very similar to a 12 bolt, in fact, it shares some parts too I believe.

If you are installing them yourself, get an accurate beam style in*lb torque wrench, paint for the gears, a torch, some way to hold the pinion while crushing the crush sleeve, some way to get enough leverage to crush the crush sleeve, and a normal set of tools that any DIYer mechanic should have. In addition, it helps to get a set of checker bearings (bearings that are honed out so when you check for pinion depth, you don't need to heat or press the bearings to remove them).

 

I think you got it the other way around. 4.10s will not put as much of a load on the engine as a lower gear would. Turbos will not make any boost without a load on the engine. Have you ever tried putting the car in neutral and reving? Hardly any boost right, but when you punch it while in gear, you see boost. With 4.10s the car will rev easier, making it easier on the engine to turn, but will not create as much of a load.

 

You are correct sir...I stand corrected!

 

Yeah I'm still trying to find a place I trust in the area to do the swap, 1 possibility so far but I'm not holding my breath.