WHICH GEAR TO PUT IN MY 05 GT? 3.73 OR 3.90 OR 4.10
08-26-2006, 12:45 AM
#1
3rd Gear Member
Thread Starter
Join Date: Aug 2006
Location: Michigan
Posts: 606
WHICH GEAR TO PUT IN MY 05 GT? 3.73 OR 3.90 OR 4.10
HI EVERYONE I AM BRAND NEW TO THE SITE, THANKS FOR HAVING ME. I HAVE A 2005 MUSTANG GT. NAMED "1BADD05" LOL ANYWAYS SO FAR THE MODS I HAVE DONE ARE: PYPES OFFROAD H-PIPE, FLOWMASTER 40 MUFFLERS, THROTTLE BODY SPACER, K&N COLD AIR INTAKE,AND PLENTY OF BODY MODIFICATIONS & INTERIOR MODS. BUT MY QUESTION TO EVERYONE IS FIRST OF ALL WHAT IS THE BIG DIFFERENCE BETWEEN 3.73 & 3.90,4.10 GEARS IN MY MUSTANG? WHICH WOULD YOU RECOMMEND & WHY? WANT TO GET THE GEAR DONE BEFORE WINTER COMES AND DON'T KNOW WHICH ROUTE TO GO? ANY INPUT WOULD BE GREATLY APPRECIATED! THX AGAIN
08-26-2006, 01:03 AM
#3
3rd Gear Member
Join Date: Apr 2005
Location: VA
Posts: 991
RE: WHICH GEAR TO PUT IN MY 05 GT? 3.73 OR 3.90 OR 4.10
You did not say if you have a man. or auto if you have a man. you will not see much difference between the 3:73 and the stocked 3:55 gears if you have a auto you will see a bigger difference between the 3:31'S. I have a auto and put the 4:10's on and boy it makes a difference I run about 2,900 Rpm'S at 80 mph. As far as 3:90 gears I don't think Ford racing makes them for our car. If you buy any thing but Ford racing gears you could be asking for a lot of noise issues.
08-26-2006, 01:11 AM
#4
2nd Gear Member
Join Date: Jun 2006
Location:
Posts: 336
RE: WHICH GEAR TO PUT IN MY 05 GT? 3.73 OR 3.90 OR 4.10
Ric-
Are you using bigger tires or did you lower you Mustang?
Will Ford install these gears if I buy them elsewhere? Anyone know a reputable dealer for the gears?
Are you using bigger tires or did you lower you Mustang?
Will Ford install these gears if I buy them elsewhere? Anyone know a reputable dealer for the gears?
08-26-2006, 01:25 AM
#5
3rd Gear Member
Join Date: Apr 2005
Location: VA
Posts: 991
RE: WHICH GEAR TO PUT IN MY 05 GT? 3.73 OR 3.90 OR 4.10
ORIGINAL: BigNasty06
Ric-
Are you using bigger tires or did you lower you Mustang?
Will Ford install these gears if I buy them elsewhere? Anyone know a reputable dealer for the gears?
Ric-
Are you using bigger tires or did you lower you Mustang?
Will Ford install these gears if I buy them elsewhere? Anyone know a reputable dealer for the gears?
I have the Eibach Sportline. A dealer will install your gears if you use a dealer that is performance oriented they might require you to buy the gears through them but I'm not sure of that but they will charge you out the a** for the install.
08-26-2006, 01:47 AM
#7
RE: WHICH GEAR TO PUT IN MY 05 GT? 3.73 OR 3.90 OR 4.10
ORIGINAL: RICVA05
You did not say if you have a man. or auto if you have a man. you will not see much difference between the 3:73 and the stocked 3:55 gears if you have a auto you will see a bigger difference between the 3:31'S. I have a auto and put the 4:10's on and boy it makes a difference I run about 2,900 Rpm'S at 80 mph. As far as 3:90 gears I don't think Ford racing makes them for our car. If you buy any thing but Ford racing gears you could be asking for a lot of noise issues.
You did not say if you have a man. or auto if you have a man. you will not see much difference between the 3:73 and the stocked 3:55 gears if you have a auto you will see a bigger difference between the 3:31'S. I have a auto and put the 4:10's on and boy it makes a difference I run about 2,900 Rpm'S at 80 mph. As far as 3:90 gears I don't think Ford racing makes them for our car. If you buy any thing but Ford racing gears you could be asking for a lot of noise issues.
08-26-2006, 04:14 AM
#8
3rd Gear Member
Join Date: May 2006
Location:
Posts: 700
RE: WHICH GEAR TO PUT IN MY 05 GT? 3.73 OR 3.90 OR 4.10
I'm seriously considering this modification. I have an 06 auto GT with the stock 3.31. Anyway, I plan on installing both the gears and an aluminum driveshaft at the same time.
I'm considering 3.55's or 3.73's. I can't decided!
My good friend at work tells me that the 3.55's will hardly make any difference at all (about 7% higher RPM's at a given speed vs. 12% higher RPM's for the 3.73's).
I'm leaning towards the 3.55's, less wear and tear on the engine and better gas mileage. I'm also hopping that the alumnium drive shaft makes up for the difference between the 3.55 gears and 3.73 gears. Any thoughts?
By the way, here is a handy calculator that computes engine RPM for various gears / tire sizes.
http://tech.oldsgmail.com/axle_RPM.php
I'm considering 3.55's or 3.73's. I can't decided!
My good friend at work tells me that the 3.55's will hardly make any difference at all (about 7% higher RPM's at a given speed vs. 12% higher RPM's for the 3.73's).
I'm leaning towards the 3.55's, less wear and tear on the engine and better gas mileage. I'm also hopping that the alumnium drive shaft makes up for the difference between the 3.55 gears and 3.73 gears. Any thoughts?
By the way, here is a handy calculator that computes engine RPM for various gears / tire sizes.
http://tech.oldsgmail.com/axle_RPM.php
08-26-2006, 08:08 AM
#9
4th Gear Member
Join Date: Jun 2006
Location: CA
Posts: 1,700
RE: WHICH GEAR TO PUT IN MY 05 GT? 3.73 OR 3.90 OR 4.10
anyone that is lookin at gears and is worried about milage has to make a decision, 3.55's vs 3.31's is a complete waste of money
Street - manual 4.10 auto 3.73
street/track - manual 4.30 auto 4.10
these are pretty much written in stone as far as our cars go. stick with FRPP gears PERIOD
Street - manual 4.10 auto 3.73
street/track - manual 4.30 auto 4.10
these are pretty much written in stone as far as our cars go. stick with FRPP gears PERIOD
08-26-2006, 10:09 AM
#10
3rd Gear Member
Join Date: May 2006
Location:
Posts: 700
RE: WHICH GEAR TO PUT IN MY 05 GT? 3.73 OR 3.90 OR 4.10
I'm more concerned about what running at 200 - 300 higher rpm is going to do to the engine after 10 years or so. I plan on having this car for a long time. Gas mileage isn't as big of a concern, since this is a second car. If gas gets really high, then I'll just drive it less.
Still acceleration is probably the hardest on the engine and gears should make it a lot easier for the engine to bring itself up to speed due to a greater mechanical advantage. Maybe I'll just go with the alumnium drive shaft right now, it's a simple bolt on. If that's not enough, then I'll start looking a gears.
Still acceleration is probably the hardest on the engine and gears should make it a lot easier for the engine to bring itself up to speed due to a greater mechanical advantage. Maybe I'll just go with the alumnium drive shaft right now, it's a simple bolt on. If that's not enough, then I'll start looking a gears.