APowers
New Member
Ok I can see how your "light to light " improved. But you traded top end. Explain to me how this is better. I am not trying to sound dumb, but what was the advantage to the trade off?
4.10's installed-wow!
- Thread starter seattlegt
- Start date
Rock36
Member
APowers said:
The advantage is that you don't really notice the loss in the top end. With the 4.10 gears on a manual transmission with stock tires, the car is still capable of reaching around 174 mph @ 6000 rpm in 5th gear before it gears out.
For comparison the 3.55s can take you to 200mph @ 6000 rpm in 5th. So your loss of top end is in an area beyond the reach of the Mustang anyway. Unless you have a significant amount of extra horsepower.
FL2005GT said:sacrstang said:I remember when I picked the car up after they were installed. I almost spun out leaving the parking lot. I was testing it outQUOTE]
I'm planning on 4.10's. I also plan to go with some wider, stickier rubber on the stock 17"X8" rims so I can hook up. I have a 5-speed GT.
Do you all think 275 (the widest you can really put on an 8" rim) 45 ZR-17's, in a summer tire, would work? Maybe even 255 45 ZR-17's?
I was told by the wheel company and Les Schwab that I should stick to the 275s with the size wheel I have. I was pushing for 295s initially. I was pretty happy with the way they looked once they put the rubber on.
Notchbck93
New Member
cowtown
Founding Member
Either a Diablo or SCT Tuner can do the trick as far as letting the computer know the change.
I know that stock to stock a while back with various late 80's stangs there was a big difference in the 3.08 to 355 and 373 gears, it really does feel a whole lot different.
I'm going with the 3.73's with my Auto, after running all the calculators and the rest I'm happy with their RPM and changes. I think the 2 steps will make a nice jump around town and at the track with little sacrifice otherwise.
I know that stock to stock a while back with various late 80's stangs there was a big difference in the 3.08 to 355 and 373 gears, it really does feel a whole lot different.
I'm going with the 3.73's with my Auto, after running all the calculators and the rest I'm happy with their RPM and changes. I think the 2 steps will make a nice jump around town and at the track with little sacrifice otherwise.
CobraRed_96_GT
Active Member
I'v been debating this one too, the price of the gear and pinion itself is a steal but w/ a $300 intsallation charge when u supply the parts and bearings if u need em it's kinda hard to stomach on top of worse gas milage. BTW it's the installation that makes the gears wine i.e. the placement of the shims n such not the brand, tho agreed FRPP is the best
welchy said:
Last time I researched all this and did the math, 4.10 gears will put you right about 400-500rpms higher depending on the speed you're going and what gear you're in, and 3.73 gears will put you about 200-300rpms higher in the same regard.
EDIT: This opinion is based on the manual transmission!
If anyone is debating spending this kind of money, do NOT go with 3.73 gears... you will not be satisfied with the results vs. money spent! Definately get the 4.10's!
(3.73 might be a better choice for automatics) 
And you will not get worse gas mileage unless your driving habits change (but this is the whole point anyhow right?!) Remember, yes you'll be running slightly higher rpms to go the same speed, BUT your engine wont have to work as hard to do it, because your torque is multiplied more! So it just about evens itself out.
The science behind it all goes a little deeper too... now if you run a little bit taller of a rear tire to get the final drive ratio down to about equivilent to 3.90 gears, and if you just simply drive a little bit slower on the freeway to stay at the same rpms you're used to driving at, given the above engine load information, then you'll actually get slightly better gas mileage!
But to hell with all that anyways, lol, I plan on running 4.10's very soon again with this Mustang
Quick update on RPM and milage. I am turning 2400rpm at 65MPH and I have lost about 1/2 MPG. This was running both an 87 Octane tune and a new 91 Octane tune (wish 93 octane was available in WA) I had 3.73's in my Bullit Mustang, but after getting the 4.10's I can say it's a big difference(my Bullit pulled 260 to the wheels on a dynojet so I'd say that it is a fair comparison. The 4.10's make you feel like you have a roots supercharger when you are light on the throttle. If you floor it, it is noticbly quicker, but it's more like when I got my Tune and Induction system, good, but makes you crave more power... 
BigWorm2005GT
New Member
seattlegt said:
Glad to hear you're enjoying the new gears! I'm about one step away from pulling the trigger and having Brad's install a set for me as well.
As for the gas, I believe the Sunoco at the Auburn Supermall sells 93 octane. Don't know how long a drive that is for you, but if there's one, there's bound to be more.
Hello everyone.
I've been around for a little while, mainly looking for tech items re. putting an 89 5.0 in my 74 Bronco.
I picked up my 07 GT yesterday, (5 weeks from order date), and am now looking at tweeking it a little.
I understand low gears, (the Bronc has 4.56's), my question is how much more rowing through the gears is involved with the gear swap? Is it very noticable?
First already seems pretty low to me. If I am not redlining every time am I going to wish for taller gears for normal driving?
I like a peppier car like everyone else, but most of the time I am just driving, not racing.
I've been around for a little while, mainly looking for tech items re. putting an 89 5.0 in my 74 Bronco.
I picked up my 07 GT yesterday, (5 weeks from order date), and am now looking at tweeking it a little.
I understand low gears, (the Bronc has 4.56's), my question is how much more rowing through the gears is involved with the gear swap? Is it very noticable?
First already seems pretty low to me. If I am not redlining every time am I going to wish for taller gears for normal driving?
I like a peppier car like everyone else, but most of the time I am just driving, not racing.
projp said:
Welcome to the world of Mustangs!
It's gonna be fun
From my experience with this transmission paired with 4.10s the shifting isn't drastically changed all that much. I mean, say you're driving normally (i.e. not like a bat outta hell) and you're at a red light getting ready to turn left. You'll now half to change to 2nd gear about half way through the turn rather than almost done with the turn. But you could make it all the way through it in 1st if you slowed down to grandmas driving style
Another example would be that the 4.10s aren't enough of a change to make a habit out of starting out in 2nd gear from stops, although it can be done. You'll still like and use 1st gear
Do you have a manual or automatic? If automatic, go with 3.73 gears, better match for the gearing in the auto trans.
jberylec said:Do you have a manual or automatic? If automatic, go with 3.73 gears, better match for the gearing in the auto trans.
Please explain before I purchase the gears for the automatic Roush. I have always read tec articles the rule of thumb was to gear one step lower for a auto like 4:10's vs the 3.7 or 3.9 that would be used for a stick. Is it not the rule in this case or maybe things have changed because the new generation auto's have different gearing?
Thanks,
Bullitt2343 said:Please explain before I purchase the gears for the automatic Roush. I have always read tec articles the rule of thumb was to gear one step lower for a auto like 4:10's vs the 3.7 or 3.9 that would be used for a stick. Is it not the rule in this case or maybe things have changed because the new generation auto's have different gearing?
Thanks,
I'm sure there are other reasons, but the one that stands out is that with an auto transmission you dont have such a great highway overdrive. Meaning you'd be turning higher RPMs on the freeway than you would with the manual, so Ford stocks a numerically lower rear-end gear to begin with! Auto's come with 3.31:1 and Manuals come with 3.55:1
So, changing an auto to 3.73 is very close to the same end result as changing a manual to 4.10
Deciding between 3.73 and 4.10 for an auto, hmm, it really just depends on what kind of driving you do mostly? and if you care about gas mileage!? Do you do a lot of racing?? If you do then get the 4.10s! You'll be chirpin' 2nd gear with an auto,
PDXStangDude
Member
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