acadian

Where is a good place to get the 4.10 gears? Christopher, did you order them of the net, and if so... do you have a link? And you said the total was $580... that was for the gears and installation? And finally, how long did it take for the shop to install the gears?

acadian

Or anyone else who has gotten new gears for the 2005 Mustang... where did you get them from, how much were they and how much to have them installed? I may be adding this to my list of future mods.

clintoris

Ford Racing sells Richmond gears... the same brand that is used from the factory. Excellent gears... they have them for $189 or $198... something like that... then just find someone to do the labor. Richmond is part of the Dana Corporation... Spicer... it's high quality hardware.

Evil_Capri

for sure (with the auto), but I think you would actually GAIN top end with the M5 (as well as acceleration). Think of it like this. At 145 mph in 5th gear, you are turning about 4300 rpms with stock rubber and 3.55s. Remove the speed governor (reflash the ECU) and you will certainly hit the cars aerodynamic drag limit long before the theoretical rev-limited top speed of 209 mph (@6250 rpm in 5th gear).

Say for the sake of argument that the car is drag limited at 160 mph, meaning the that it cannot overcome the wind resistance at that speed, making whatever power it is making at that rpm (in this case 4777 rpm)

Swapping out the 3.55s for a set of 4.10s will indeed bring the theoretical rev-limited top speed down to 181 mph (hence the notion that shorter gears sacrifice top end), but again, no 300 hp car weighing 3500 lbs is going to hit that speed anyway. Just as with the stock gears, the car's top speed is limited by aerodynamic drag, but this time the car is making MORE power at each speed, due to the multiplicative effect of the gears. Referring back to the hypothetical top end of 160 mph, a car with 4.10s would hit that same speed while turning 5517 revs, concurrently making quite a bit more power (say....20 hp) than the stock-geared car makes at 4777. With power to spare at 160 mph, the shorter geared car can and will reach a higher top speed before hitting its drag limit. It is a mathematical certainty.

In short, I believe shorter gears will actually increase both acceleration AND top end in the real world, at least for a stock or minimally modded car. In fact, it may even be the case that the auto would also benefit (in terms of real word top end) from a gear swap, though I believe the 5th gear final drive ratio is already pretty favorable for the auto...
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(I knew a post like yours would follow. )

Would be a cool 'real world' test to perform.

swingle007

Paid 500 out the door for the Ford Racing 4.10's and labor to install...Took the shop a few hours, which passed by very slowly as I anxiously waited to go out and stomp the crap out of the accelerator...LOL I get the same drone as many others at around the 2000 rpm mark..I drive at more like 90mph instead of 70-75 on the freeway and the car is nearly silent at 90mph, I kid you not....amazing the difference it makes...fells like the 4.10's just need to move a bit faster and they're fine....of all the mods I've made the gears are still my fave..instant fun and great bang for the buck!!!

John

MilStang

Ok, my question is did it affect your gas mileage at all switching to the 4.10 gears?

I know how you drive has a huge factor on it, but I am looking for conservative drive times with the gear changes. I still have to have mine as a daily driver as well.

My Blue Heaven

I got motive gears that were supplied through the shop. The 580 was the out the door price, including local tax, shop costs and fluids etc. I've seen 500 as an average price for the job. It took this particular shop all day. I dropped the car off at 8:30am and picked it up at 4:30pm.

I've seen 4.10 advertised for 180 in some magazines, and I believe those were FRPP gears.

Chris

swingle007

I get 18-20 mpg on the freeway at like 75 on cruise control....I get more like 13 in the city when I do stop an go driving on a tank....if you do a nice split between the two then you should see something in the middle of those two overall...probably 15-16 mog on a tank with the 4.10's and a good mix of some hwy and some light to light gas stomping..

John

My Blue Heaven

As I've just gotten them installed I can't tell you gas milage numbers yet. I do know I am averaging 17.2 over the life of the car with my last fill up getting me 18.9 mpg. I was running the 89 octane corn blend but read where that gave you worse milage, so I switched to the 4 cent more expensive 87 octane and my milage jumped up to the tune of 2 mpg's.

After I read the 5.0 Mustang article concerning the jump in hp from running 91 I switched to 91 and that's what's in the tank now.

Chris

flyersfaniv

I just received my 4.10s from Precision Gears the other day. I got them for $200 and that included a mini install kit. Unfortunately I can't have them installed till the end of march because I need to save up money for the install of the gears and pulleys along with the SCT Tuner. I figure it will be worth the wait to do it all at once.

swingle007

I'm running the SCT 93 octane tune and full time 93 in the tank just to clarify....

John

My Blue Heaven

I'm getting mine dynoed and diablo tuned either tonight or tomorrow night, and 91 is the easy fuel to find here for me.

Chris

wild stray

My city mileage hasn't changed much going to the 4.10's. Haven't had it out on the road much.

MilStang

Thanks for the quick replies everyone! I will have to add this to my list as well now.

So many things to add ... June can not arrive to soon! :bang:

My Blue Heaven

Update on the Gear swap. I took it by the shop at lunch and they agreed with me, there's a problem. New gears are on order and as soon as they get them in they'll swap it out under warranty. now as long as I don't drive between 54.8 and 63 mph I'm a ok

acadian

Anyone who has had the 4.10 gears installed know how much HP increase you got just by switching out the gears? I'm hoping for more than 15 RWHP for $500+.

swingle007

There's no hp increase....but it'll use the existing power to make the car accelerate better then the stock gears will...

John

acadian

Thanks, John... that makes sense.

HOTLAP

The drone has always been there, but only noticeable every now and then. And as the 2K rpm range isn't used much with the 3.31 it wasn't a problem. I normally heard it going up the hill in my neighborhood around 25/30 mph. The gearing was just right for the 2k range.

Well, now with the new gear that seems to be the cruising range rather than the 1500 range before with the 3.31.

Do a search for exhaust drone and you'll see that the 05 GT stock exhaust indeed has some drone issues. Changing my gears just brought it to the forefront. I'll find a way to fix it.
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Mine didn't really have the drone issue - guess it's a subjective call - but mine has never been loud enough to really bother me - even with the Magnaflow Axel backs installed...I had Flowmaster Series 40 (2 chamber) exhaust on my '00 GT for a while - now THAT's a drone :notnice: couldn't even hear my passenger talking at the 2000 - 2300 RPM level. Try Dynamat Extreme in the trunk floor, and even on the underside of the spare tire well and muffler area - I've used it on my last 2 Mustangs and it is well worth the $$'s. Good Luck

MilStang

Definitely agree with the Dynamat as a "must have mod."

One last question as I never changed gears in my last Mustang.

If you have the gears changed does that void the warranty? .. or will the dealership install and let your current warranty stand.

Doubt that last part will be the reality but wanted to ask anyways.

Thanks for any guidance.