Gears???
2nd Gear Member
Joined: Mar 2009
Posts: 341
From: Tustin, CA
im having this same problem. I cant decide between 3.73 and 4.10. The only thing holding me back from 4.10s is with my MACs already droning on the freeway at 75mph im worried how much worse 4.10s would intensify the drone. I drive freeways ALOT
3rd Gear Member
Joined: Dec 2009
Posts: 671
From: TN
Me too! I truly believe now that what I was hearing from everyone that the 5 speed in our cars is just meant for 4:10s. Before I switched, what I had to get over was the old mindset of 4:10s in 70's musclecars with 3 speed trannys and turning 4 grand at 60 mph LOL!
5th Gear Member
Joined: Jul 2006
Posts: 4,491
From: New Orleans
Ideally, you want to trap in your 1:1 gear (4th) as deep as possible without having to shift into overdrive.
5th Gear Member
Joined: Jul 2006
Posts: 4,491
From: New Orleans
2nd Gear Member
Joined: Oct 2008
Posts: 232
From: Alabama
Just found ou that my 09 GT only has 3.31 gears. I was under the impression that I had 3.55 gears. I found out about this when I was getting the info for my tune from brenspeed. Now I need to order gears and have no idea what to get. I basicly use the car as a fun weekend car and I dont race it on the track. I do care about performance and speed but I dont want anything too extreme. Now my question is should I get 355, 373 or 410's? From what I've read 410's might be too much. Any opinions?
At the track I raced other mustangs with 4.10s and similar mods and street tires and they got the jump on me in first gear but by time I hit third gear I started pulling on them. Note: that's just the ones I beat. The mustangs with DRs had at least a car length on me through 1st and at least 2 or three car lengths by 3rd gear; they pull like crazy through all gears. IMO from your statement you should get the 3.73s.
2nd Gear Member
Joined: Jun 2009
Posts: 277
From: California
I had a friend in High School who had a 67 mustang with the usual Muscle Car Mods for the day including 4.11s in the rear. First was good for burn outs or the first 40 feet depending. Had some good parking lot fun. Freeway wound up the engine good though. Seemed a little on the extreme side to me even for then.
2nd Gear Member
Joined: Jun 2009
Posts: 277
From: California
Just found ou that my 09 GT only has 3.31 gears. I was under the impression that I had 3.55 gears. I found out about this when I was getting the info for my tune from brenspeed. Now I need to order gears and have no idea what to get. I basicly use the car as a fun weekend car and I dont race it on the track. I do care about performance and speed but I dont want anything too extreme. Now my question is should I get 355, 373 or 410's? From what I've read 410's might be too much. Any opinions?
From 3.31s to 4.10s is a 19% increase in RPM and Torque.
From 3.31s to 3.73s is only a 11% increase.
From 3.31s to 3.55s is a 7% increase.
Ford offers 3.73s in its Bullitt, Trackpak options and the KR. They do not have any configurations with 4.10s
With 3.73s you can get a ford dealer to re-calibrate the speed-o on your stock tune as they have a tool for that. 4.10s are not supported so you will need a 3rd party tuner but you have that covered.
Of course you pays your money and takes your pick.
Last edited by Cusp; Jan 12, 2010 at 05:52 PM.
