4/10s and a tune. got them both done yesterday and loved it
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2001 Mustang GT.Tropic Green ( SU ftw ), AM Cold Air Intake. Pypes Off road X pipe. NGK platinum Spark Plugs. Steeda Tri-ax Shifter. Sniper Dyno tune. 4.10 FD ratio
as joker does make a VERY good point, i think i would still go with 3.73s just because i tend to like to ride out 1st around town where all the ladies are walkin around in bikinis hahahaha
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"Its not about what you can BUY, its about what you can build" anyone can buy a really cool car, but u dont ever get the satisfaction from it as you would building it yourself 1994 Mustang GT 5.0/T5 Sold 1998 Mustang GT 4.6/T45 *soon 5.4 S/C* Flows cat-back, CAI, Ford Racing 3.73 gears, Torsen Diff, short throw shifter
...and decide for yourself, I guess. This is the guide I used to install my gears. I went with 4.10s but my car isn't a daily driver, it's just my haulin' ass play car.
Also, I'd go with the Ford Racing gears because of the information mentioned in the link.
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'99 GT - My increasingly expensive DIY project car... Vortech V1, Moser 31-spline axles, FRPP diff. w/ 4.10 gears, Steeda Tri-Ax Shifter, Shany Custom pipes, JBA shorty headers, Powerslot rotors, Tokico D-specs, H&R Sport Springs, Steeda Strut Brace, MM X-duty Lower Control Arms, Autometer Phantom Boost and Wideband AFR guage, Custom Rear seat delete, Royal Purple, NGK, BFG
ok thats probably not gonna work for me installing them myself .... any places where i can take it to?
I honestly don't know, man. You're gonna pay quite a bit would be my guess. I've heard people say anywhere from $300-$700 in the forums here. If I absolutely had to pay someone to do it, I'd do a lot of research first. Google your local shops, make some phone calls or better yet, go do a face-to-face with some shop owners and find out who will do it for the least cost.
Check around and make sure you go to a trustworthy shop. I've also heard of people getting screwed by shops who did a bad install and refuse to back up their work. But...that goes with anything. I like to do my own work. It's a hobby, and if I screw something up then I don't have to waste time getting pissed at anyone but myself.
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'99 GT - My increasingly expensive DIY project car... Vortech V1, Moser 31-spline axles, FRPP diff. w/ 4.10 gears, Steeda Tri-Ax Shifter, Shany Custom pipes, JBA shorty headers, Powerslot rotors, Tokico D-specs, H&R Sport Springs, Steeda Strut Brace, MM X-duty Lower Control Arms, Autometer Phantom Boost and Wideband AFR guage, Custom Rear seat delete, Royal Purple, NGK, BFG
what gears to use? 
RPMS
