right now i have 3:73's i have been told by other forums go 4:30 or 4:56's beacuse the cobras liek the higher rpms. my ? is what speed would 4:10's top at at and the same go's for the 4:56's?

also how much of a diffrence speed wise would the 4:30's be from the 3:73's? i plan in the future to do a s/c hopefully a kb.

 

I have stock gears but i know that for a fact 4.56 are kinda high for a cobra and will really affect ur top end...of wat i heard 4.10 will top out around 130 or so not sure though...now if ur planning on gettina blower anytime soon u should get some 3.55 or something around there anything in the 4's i think might be to high for a blower....

 

This is a gear calculator... hope it helps.
http://www.izook.com/gearcalc.htm

 

Theoretical top speed with 4.10s would be 175 mph (@6k rpm, assuming the engine had the grunt), with 4.56's you might have enough power to hit the calculated max of 157 mph.[/align][/align]Top speed with our cars is much more impacted by horsepower than gears, if you had the power the stock 3.27 gears would hit 220 mph @ 6k rpm--it's not 'til you get to 4.10 or higher (ratio), and a lot more power than stock, that top speed becomes a gearing issue...[/align][/align]I've had my '03 GT (3.73s) up to 143.6 mph per my GPS (it got up to there pretty quick, the "butt-radar" said it had another 5-7 mph in it if I had kept it floored for another 1/2 mile or so) and am pretty sure I wouldn't want to go a whole lot faster inone of thesecars...[/align]

 

Here's a better gear calculator. I've been trying to get this one stickied....

http://www.svtoa-atlanta.org/cgi-bin/trans.cgi

 

4.56 in a mustang? haha i couldnt get my 4.10's to stick when i was somewhat stock, couldnt imagine the 4.56 why not go 5.13 then haha. 4.10's for autos and 3.73 for 5 speeds is basically the unwritten rule in here.

 

+1 4.56 sounds like tooo much gear. I would go with 4.10's if you want more, but with a s/c, i wouldn't go 4.30s +

 

I have 4.30's in my GT, and since I'm staying N/A, they are great for me. Since you have a Cobra and are going to be doing F/I in the near future, I would definitely stay away from 4.56's, and probably the 4.30's as well. You may be better of doing the S/C and all that stuff first, then deciding what gears would compliment the setup the best. For all you know, the 3.73's could end up being perfect.

 

ok if i got 4:10's how is it going to be a big noticable difference or shoudl i just stick with my gears.

this is my street car i have yet to be to the track but i do plan on doing so in the future.

thats why i thought if i go 4:30's with s/c my car may top out at 120ish mph but i guess i was wring.

lol faster it tops out less trouble i get in for speeding.

 

4.30