2003 mustang gt 3.90 0r 3.73 rear gears - Ford Mustang Forum
 
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post #1 of 12 (permalink) Old 08-18-2011 Thread Starter
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2003 mustang gt 3.90 0r 3.73 rear gears

I definatly want to get some gears for my gt but i debating on which ones cause i want it to be quicker but whil not hurting my mpg at the same time so i was woundring what you guys think.

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post #2 of 12 (permalink) Old 08-18-2011
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If it were me id choose between 373 or 410, not 390's. I know alot of people on here and in person that bought 373s and regreted it. I also know people on here that say the 410's are amazing and that they actually got better mpgs with 410's over stock. Dont know how that makes sense but im guessing your able to be in the "right gear" while driving in the city. Instead of driving around in traffic in 2nd gear at 2500 rpms you could be in 3rd around 2000 kinda deal, Instead of bogging down in 3rd.

THis is what my buddy told me and ive acutally seen mpg improvement so i guess its true. hope this helps

Get 410's dont be P**SY:smilie

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post #3 of 12 (permalink) Old 08-19-2011
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If you plan on ever adding boost I say go ahead and get 373. I noticed a difference in my 373 over stock 327 and still get decent gas mileage. If your not gonna do anything more than basic bolt ons then consider 410.

-04 Mustang GT-Intercooled Kenne bell 2.1L supercharged @10psi, bolt ons, 3:73 gears, big brake upgrade, some suspension, 315's rear.

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post #4 of 12 (permalink) Old 08-19-2011
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4.10's.

/thread.




Seriously though, if you do plan on boost in the future, 4.10's should be fine with a centri blower. Do 3.73's for a twin screw. Turbo, keep stock gears or if you have to then maybe 3.55's.

If you intend to stay n/a, then 4.10's. If your car is an auto then 4.30's.


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All the usual bolt-on's /200 I6, C4

And a few Explorers too... 2008 4.0 XLT 4x2, 1996 XLT 5.0 4x2, 2003 Sport Trac XLT 4.0 4x4
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post #5 of 12 (permalink) Old 08-19-2011
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I've been seriously considering 4.10's as well, my only question is for the quarter mile (with nothing more than mild bolt-ons, etc) are you guys able to keep it out of 5th gear? I was doing some mental math and at 3.27's, the top of 4th (I'm saying 5500 rpm) would be about 135-140 (based on 37 mph at 1500 rpm in 4th), so with 4.10's it would be about 110 or so, which could be close to the trap speed after 4.10's and a few small mods, correct?

What are you guys actually seeing?

2002 Mustang GT: 5-spd, 96k: CAI, IAC restrictor plate, Mac Prochamber O/R, Borla Stingers
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post #6 of 12 (permalink) Old 08-19-2011
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Quote:
Originally Posted by redriderjf87 View Post
I've been seriously considering 4.10's as well, my only question is for the quarter mile (with nothing more than mild bolt-ons, etc) are you guys able to keep it out of 5th gear? I was doing some mental math and at 3.27's, the top of 4th (I'm saying 5500 rpm) would be about 135-140 (based on 37 mph at 1500 rpm in 4th), so with 4.10's it would be about 110 or so, which could be close to the trap speed after 4.10's and a few small mods, correct?

What are you guys actually seeing?
4.10's on a bolt on car (just to clarify, that means no power adder) you shouldn't need to get out of 4th before hitting the end of the track. With a power adder, say 100 shot, you'll need larger rear tires to keep from running out of gear; stock is 26" tall, 28" seems to be fairly common for a situation like this.


2001 GT Convertible
/1967 Coupe
All the usual bolt-on's /200 I6, C4

And a few Explorers too... 2008 4.0 XLT 4x2, 1996 XLT 5.0 4x2, 2003 Sport Trac XLT 4.0 4x4
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post #7 of 12 (permalink) Old 08-22-2011
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Ok thanks. 4.10s it is then.

2002 Mustang GT: 5-spd, 96k: CAI, IAC restrictor plate, Mac Prochamber O/R, Borla Stingers
268 rwhp / 312 lb-ft

2015 Chevy Colorado 4cyl, 6-spd manual
1972 Yamaha CT2 175cc
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post #8 of 12 (permalink) Old 08-22-2011
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You will be happy with what ever you go with.The stock gearing is crappy.

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post #9 of 12 (permalink) Old 08-23-2011
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One of the Mustang Commandments:
"Thou shalt not fear thy gear."

You didn't buy the Mustang to save gas anyways right?
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I put 3.73s in mine. Definitely felt a difference. I hit about 2000rpms at about 65mph. Plenty enough rpms for me. I still get over 20mpg

just make sure you get a Gearing re-calibrator.
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is it auto or manual?
and what did u choose
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4:10 all the way! Had 3:73's before and wouldn't go back.
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