Hey Guys!
I will be getting a t-lok and gears installed within the next few weeks or so.
Just curious what everyone's preference was with our V-6's..
I have an 06 Auto with 255/65r16's out back (29" tall).
I might be doing an X-charger eventually as time/money permits, But not anytime soon.

I already have an intake, takeoff GT mufflerand tune and fat tires out back.
I drive 30 miles each way every day in good old long island rush hour traffic.

Will 4.10's kill my parkway driving and increase engine wear due to higher rpms?

I'm open for suggestions..
Just want the car to be a bit more fun not dangerous, or ridiculously bad on gas.

Thanks!

 

BlkSunshine77, I've installed 4.10s in my rearend and am very happy with them. I have a 2007 V6 5-speed with stock 215/65/16 tires (27 inches tall). If you're going to keep the 29 inch tall tires on the car I would go with the 4.10 gears because your not going to get theadditional acceleration expected with installation of the 3.73 gears. You won't be happy with the result for the money spent. Now if your going to change back to shorter tires in the 27 inch tall range, then 3.73 gears will give you "acceptable" additional acceleration and make the money spent worth it. It's very important to understand that when one makes gear changes, you also make running rpm's change. Shorter gears mean higher rpm's. At 60 mph with my above setup I'm running about 2300 rpm, and at 80 mph I'm right on 3000. Not bad for 4.10 gears and the acceleration I get for the money spent. It's up to you though, choose wisely. By the way, I only lost 3 miles per gallon on my highway mileage with the new 4.10 gears. I now get 26 mpg instead of 29 as with the stock 3.31 gears. Take care, Jack (Sarasota, FL).

 

Thanks for the well written response.
I greatly appreciate it.
I was originally heavily leaning towards 3.73's but since you pointed out that the 29" tall will take some gear out of it, it makes sense.
My current gas mileage is between 22-28 city/hwy mix. So it will probably average out to be around the same if I can keep my foot out of it.
I dont think that the 4.10's will hurt me too much on the parkway since I'm running a much taller tire. A 2" taller tire probably knocks the 4.10's down to 3.90's. So the rpms will be a bit lower than what you posted, which I can live with.
I was just worried about spending about $800+ on a mod and not being satisfied with the results.
But then again, going from one leggers to posi burnouts makes it all worth while. LOL

Where is the cheapest place to get the Ford 4.10 gears and t-lok?
And do I need an install kit as well?
I saw that v6_mustang_stuff dot com haseverything, just curious if anyone knows of a cheaper place online.
Thanks again!!

 

Blksunshine77, forgot to mention one very important item here, since we all have our new S197 (05-07) body Mustangs, when you switch your gears you'll need to reflash your car's computer to tell it you're running the new 4.10 gears. This is extremely important for a car with an automatic transmission because if you don't reset the gear factor in the computer you can seriously damage internal parts and clutches in your auto trans. If you don't reflash the computer, your computer and trans will be communicating things to each other that are still based on the stock gears. So I hope you have a chip tuner like an SCT Xcaliber or something that allows you to reset the gear ratio in the computer. Also, when you do reflash, if you have the option of reseting your tire height, do that as well. Such as reseting the tire height from 27 inches to 29 inches.

As for a "cheap place" to get your gears and t-lok, get 'em directly from a Ford dealership. Don't sacrafice here! I got mine from Sarasota Ford here where I live and they were only a few dollars more than most of the places on the web. Also, talk to the mechanic first that's going to do the installation for you to coordinate what he needs (installation kit wise) for the job. Again, don't cut corners here, gear change and installation are a BIG DEAL. Make sure it's right the first time.

Jack

 

4.56s, 4.10s will be your effective ratio meaning it will make your car act stock with the 29" tall rubber

 

I have an Xcal2 with 91 performance tune already and adjusted the rev/mile or something like that to the tire specs, so the speedo is accurate.
And I know I'll have to change the Xcal2 for the 4.10's after they're installed.
Thanks..

Ahhhh.. So to get the actual 4.10 feel, I would need 4.56's with a 29" tire.
So the 4.10s wouldfeel like 3.73's?

I'm willing to live with thatfor daily driving.
4.56's seem to be too much, even though it works out to be actually 4.10's.

Would 3.73's with a 29" tire work out to be 3.55's? or would it bring me back down to the stock 3.31's?
I dont have the calculator handy.


I have a few mustang specific gear shops locally to choose from.
I got a quote of $300 which seems really reasonable to install the t-lok and whichever gears I decided on.
On v6mustangstuff, they have a price of $199 for the t-lok-new, and $239 for the 4.10's, and $94 for the master install kit with everything minus fluid. The shop only uses Royal purple and guarantees that the gears wont whine or chatter.
I think when all is said and done I'm looking around $850 or so plus tax or shipping on parts and labor from a reputable shop.

EDIT TO ADD:
Just some simple math.. Stock is 27" tall tire with 3.31 gears = 29" tall tire and 3.55 gears..
So...3.55 gears will make the car feel stock with 29" tall rear tires.
Using the same formula only with 3.73's for 27" tall, and 29" tall tires = 4.00 gears..
So 4.10's will feel closer to 3.90's rather than 3.73's.. So there should be a GOOD improvement
And 4.30's will be closer to 4.10's..
I'll play it conservative and stick with the 4.10's.. The 3.73's will be an improvement but probably closer to 3.55's..
Math is fun. LOL

 

[&:]my brain hurts

4.10s w/29" tall tire = stock gearing, so the number 4.10 would be what is called your effective ratio, meaning it will make the car stock

they dont make 4.30s for the 7.5

 

I do not see how a 2" increase with 4.10's will be the same effective ratio as stock tires with 3.31's.

The overall perforamce might be close to stock with a 3.73 and larger tire, but remember he now has 3.31 and larger tires, so I would think he would feel it. Who knows, what is you get smaller tires on down the road ?

 

Please explain your calculations or post a link to the calculator you used for that.
I can't possibly imagine how a 2" increase in tire diameter would require me to step up 4 gear sizes just to get stock performance?

Based on some Simple math, ignoring the additional weight of the tires and increased rotational mass, 27" to 29" increase would require stepping up to a 3.55 gear.

Going to 3.73's should counteract the additional weight and make it "feel" like stock.
4.10's should make it feel a lot better than stock.

 

Most will say: In Mustang application : GT, V6, Mach 1 etc.
Manuel 3.73
Auto 4.10

The reason being: the autos need more gear in general to level any auto/manuel pros and cons. Thatlogic does not take into account the newer autos are pretty good and even better with the tune.I would go with the 3.73s if you want the change them, those 29" tires will not be on there forever. Worst case it will be the same on the clock as the stock tires/gears, but you will feel the difference. I would go 3.73 T-Lok, CAI/tune, and then work on the exhaust. It would be a quick car, and still out run a stock car with 4.10's, w/o the higher rpm on the hwy, which I do no like. That is just my opinion, not the only way to do things.

The 2" increase does not mandate 4.10's. I think the 2" is being taken out of proprtion. The effective ratio is altererd-yes- but when it comes down to a street car driven for personal enjoyment, it's not going to matter.