StangMan500

I 've been reading alot on here latley.. wondering if i should do a full PI Swap, or get gears and a tuner first? I mean eventually i'll get them both, but for now which should i go with for my first mods to my '01 GT?

StangMan500

Also wondering about underdrive pulley's.. are they worth it? Any Power?

jtb727

MM500, you dont need a PI swap, as your already there. What are your goals for the car? That question severely determines which gears you will receive the most benefit from. For daily drivers the most common are 3.73s and 4.10s, alot of auto guys run the 4.10s, while alot of 5 spd people will say 3.73s, depending what you're doing with the car.. A tuner will give you a nice bump in power, and adjustability as well.

jtb727

Some will say UDPs are a waste while others have said they help with HPs, and I've been told their car "revved more freely".. Just remember they are a percentage gain, so a car with more power will benefit less than a car with less power. If you do them, get the pullies, not the piggyback pullies.

StangMan500

Thanks JTB.. I'm wanting to go atleast 400 rwhp all in all.. maybe 500 rwhp, i know it'll take some time, but in the end thats what i want. I drive the car everyday, and just wanna get alott more juice out of it, all i've got on it now is a catback exhaust (stock cats). i've heard the 3.73 gears are pretty good, what would you suggest i do for my first performance modifications on it?

StangMan500

What is the difference between a pulley or a piggyback pulley?

mrtstang

Well if you want 400+ rwhp down the road 3.73's would be a good all around gear, but 3.90's or 4.10's may be more suitable if you're staying closer to the 400 mark with a centrifugal blower.

sn95_331_GT_ yellow

4.10's and never look back...

UDP's are a joke unless you like overheating and not having enough volts to run a radio...

StangMan500

I'll probably get the 3.73 gears.. what would you say my first mods to my GT should be MRTStang? I wanna start work on it Asap.

Gt04

^correct. If you get a twin screw blower you will want either 3:73s or 3:55s. Also if you are planning on supercharging down the road don't bother with underdrive pullies, put the money somewhere else.