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Discussion Starter · #1 ·
Hey guys I'm new to this site, and I have a 2003 Mustang GT with a flowmaster exhaust, o/r xpipe, CAI, plenum and 70mm TB. I'm planning on getting a short shifter soon, and also a sound system so I cant put on polleys! so I need your help I'm out of idea's on what other performance I could put on other than supercharger. I know I can put on gears i wanted 3.55 or 3.73 but on highway speeds my RMP's would be too high like at 80mpg I'd be at like 3000rpm right? any sugestions are appresiated. thanks
 

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Gears should be your top priority, best bang for the buck. With 4.10, I run at about 2600 - 2700 rpm's at 80 mph. If your really concerned about rpm's, 3.90's might be a nice balance. As far as pullies go, I'm pushing two 10" Power Acuistics subs with a 1600 watt Pyle amp with no charging problems. I believe it's 400 watts rms, however, I have heard people pushing as much as 1000 watts rms with no problems. Also, look into tuners, as they will allow you to correct your speedo for the gear, shut off your rear O2's for you O/R X (if you haven't already), and give you a slight increase in horsepower. Good Luck
 

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I don't understand why some people are so afraid of gears? As long as you don't get too crazy with them gears are the best mod for the money. I'd get a set of 373's ( I have 410's) if you want performance increase but spend alot of time on the freeway. At 80mph you'll probably be running 2600-2700rpm. Gears always wind up being worse in your head than in reality. As far as other performance mods go, you pretty much have all the inexpensive ones covered you'll have to dig a little deeper in the wallet to continue. You can still do headers, heads, cams, custom or box tune.

I don't know how you drive your car but brakes, suspension, chassis upgrades are always an option.

Good luck
 

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as far as the pullies r concerned you should have no charging problems i have a 4000 watt system in my 03 gt and as long as the car is running you r good to go (and yea its REALLY loud:eyepoppin )
 

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I'll second the vote for gears if you don't want to put in cams or supercharger. Also look into a tuner. I would be willing to bet you air to fuel ratio is a bit out of whack right now and you'd see a decent gain from a tuner and some dyno time.
 

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Discussion Starter · #6 ·
thanks guys for all your suggestions, ya I think I'm going to do the gears first then the chip programmer. I remember reading one of the other posts saying that installing the gears is about $300??? does that sound right? and also is it hard on the engine or transmision having 3.73's on there compaired to the stock 3.27(I know it doesnt effect the engine or tranmision right away but does it over time)?
 

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It does harm anything putting in gears and yea 300 is about right for gear install. It's not cheap for being a relativey small job but worth it, make sure you find a good drivetrain shop or it will become a potential headache.
 

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$300 sounds about average. I got mine done by a friend of a friend for $95. He only wanted $75, but I threw in an extra $20 because the previous owner messed everything up in the rear and the swap was a big PITA. Any performance upgrade you do with increase wear and tear ever so slightly, but these cars can handle it. Small price to pay to go fast!
 

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gears + Tuner = Best bang for the buck... Short throw shifter is a great thing to get, and it's a bit cheaper... but Gears and a Tuner should be your priority - you won't believe how much more LIVE your car will feel and be!
 

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Discussion Starter · #10 ·
can I take my car to a transmision shop to get the gears put in?
 

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Depends on the shop.. I would ask around because if the gears aren't installed right they'll whine and can mess somethings up.. I would try to find someone thats worked on Mustangs a lot...
 
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