LuisV

forgive me for being an idiot. but how exactly can i found out my gear ratio? i keep reading other forums and people always say "look at your window sticker" and well, i've scanned over this thing countless times. its not on there anywhere. and others say, "if your going such and such speed at such and such RPMs than you have such and such gears". come on there has to be an easier way to tell what i have, i have the brembo break package, and i HOPE i have 3.73 gears. but i see people with the BBP and some have 3.55 and others have 3.73. so basically is there any TRUE way to tell what i have?

LEwis26

It would be in your option list on your window sticker. If nothing is listed, you have the stock 3.31's.

Also, just a pet peeve of mine, but it's spelled BRAKE not break.

Ltngdrvr

There is a tag on the axle housing that has the ratio on it.

If there is no optional gear ratio listed on your GT's window sticker then you have 3.31 rear gears if you have a manual transmission.

All automatic GT's have 3.15 gears as there are no optional ratios available for them.

m4reapr

if there is any more confusion after the previous correct info is still not enough:

1. if you have a manual transmission the optional ring gears of 3.55 or 3.73 would show as a $395 option on your window sticker

2. if you have an automatic transmission the ring gear is 3.15 and no optional ratio was offered for that transmission

LuisV

yeah i have the 6 speed manual. so if i have the 3.31 gear ratio, would it be wise to upgrade that if i make other mods to my car? the mods i plan on making are BOSS Intake Manifold, CAI (possibly Airaid or JLT), Tune, and Borla ATAK Exhaust. would a 4.10 ratio be a good investment?

jaybertx

Single best bang for the buck mod I have ever done to a car. Get the tuner first so that you can adjust the speedo afterward tho.

Don't fear the gear!

Ltngdrvr

Depends on what you want out of the car.

4.10 is a lot for a street car, would be good for the dragstrip.

hahnsolo78

You could look under the rearend and there is a sticker stating the ratio on the pumpkin

hawkeye18

LuisV

So 3.73 would be better for a street car?

Everett

I have 3.90s and a 5 speed and it was the best mod next to nitrous or boost for acceleration. But if you have a 6 speed you have that really low 6th gear.

Ltngdrvr

Like I posted, depends on what you are wanting out of the car.

3.73 is a OEM optional ratio so if you wanted, the dealer can flash your PCM for the new gear and you wouldn't need a tune.

4.10's and some sticky drag radials and a tune and it would be super fast at the strip.

LuisV

Yeah I need to do my research on the differences between the gear ratios. I'm thinking 3.73 would be good but since I want to get the boss manifold maybe moving up to 3.90 wouldn't be a bad idea.

LuisV

wow this website really simplified things for me. if anyone else needs more info on gear ratios (probably not since everyone answered a simple question of mine :P) and how they work, feel free to check this out. Thanks for all the help guys. i think i'll go with a 3.73 in the end.

http://www.mustangsplus.com/tech/axles/index.htm

topbliss

You don't have to climb under or locate your window stick to determine your rear ratio. Open the drivers door and look at the door jamb sticker under axle and the code will tell you what your car has from the factory

BB - 3.73 ratio
CC - 2.73 ratio
DD - 3.55 ratio
GG - 3.31 ratio
YY - 3.15 ratio

LuisV

yeah i just looked at the sticker on my car. GG. how disappointing lol. definitely need to upgrade that.

freyke

VIN = "1ZVBP8CF0B5164662" Ok then what the heck is mine? I know it has the 3:73 because it's on the window sticker.

Modshack

Huh? Trick question eh?

jaybertx

Yours is 3.73.

BTW, what color is your Ingot Silver car?

03sonic

The internet is just an amazing tool.