plenum

[19Stangnotch87]

hey ppl i need some help on this new ride that i got an 03 gt. im wondering if this here 70mm BBK throttle body with a C&L upper plenum with a fender well cold air kit with K&N filter (these parts are off a 2001) will the fit my 2003 gt? i was also thinking of putting in some 3:90s as well let me know what u guys think thanx late.

 

[Bluffing024]

4.10s if you plan on staying NA
3.73s is you plan on FI

 

[Bmfhp]

3.90's are a good gear to go with, this is assuming that this will not be primarily a race car. If your gonna race it alot go with 4.30's The plenum may need an adapter for the vacuum line that is on the bottom of it. I checked C&L's website to see and it looks like the 01 year was when they had the change in size... Ford used two different sizes depending on the year. Other than that good score on the parts.

 

[twogts4us]

And you can 'engineer' a hose adapter with a couple pieces of hose, clamps, tubing or whatever you have around the garage...otherwise, most auto parts stores will be able to help you make this work (if you don't wanna try to get the correct adapter).
My Accufab came with both adapters, so you could choose which one you needed and press it into the plenum.
Best of Luck - I'd do 4.10s for sure. 3.73s are ok, but just not enough. 4.10s hit that sweet spot.

 

[97speedster]

4.10s if you plan on staying NA
3.73s is you plan on FI

+1. Best combo

 

[Tim2002GT]

Best of Luck - I'd do 4.10s for sure. 3.73s are ok, but just not enough. 4.10s hit that sweet spot.

+1

 

[Pennywise2]

4.10s if you plan on staying NA
3.73s is you plan on FI

That's a good rule of thumb when selecting gears.