3.73 Gear Ratio for '03 Cobra????

[admdavs]

Being a complete mechanical retard- can anyone help me with what the best gear ratio would be for my almost purchased '03 Cobra. I understand now that they sit at 3.55:1- (Though I really don't even know what that means ) I've been reading here that 3.73 is the way to go, but two questions: 1) What does 3.55:1 mean? and 2) Why is 3.73 better to have??
Thanks in Advance

 

[Uncle Meat]

Being a complete mechanical retard- can anyone help me with what the best gear ratio would be for my almost purchased '03 Cobra. I understand now that they sit at 3.55:1- (Though I really don't even know what that means ) I've been reading here that 3.73 is the way to go, but two questions: 1) What does 3.55:1 mean? and 2) Why is 3.73 better to have??
Thanks in Advance

The 3.55's that come stock are fine. The car gets no traction in first gear stock as it is! Swapping to 3.73's would barely even be noticeable. The difference between 3.55's and 3.73's is very small.

U.M.

 

[missouri_guy197]

3.55:1 means that for every revolution of your rear wheel, your drive shaft is going around 3.55 times...so if you bump them down to 3.73's the wheel will spin faster at the same given RPM since the drive shaft is going around about a 1/4 more each revolution of the tire...

 

[DirtySanchez]

The difference between 3.55's and 3.73's is very small.

Yeah, it's trivial. If you're curious, I have a CGI script up at
http://www.svtoa-atlanta.org/cgi-bin/trans.cgi That shows the exact difference between two tranny/gear combos.

 

[Yellow Horse]

But .18 at 6000 rpm is 1080 revs more per minute. I run 3.90's in my 03. I had 4.10's for a few months. The main reason I changed them is because I was well over 7k rpm when I crossed the line. Hopefully when I get a Whipple this summer, I'm probably going to go to 3.73's. Right now at 503 rwhp SAE and 550 rwt, first and second is like driving on ice.

 

[1999SVTVert]

3.55:1 means that for every revolution of your rear wheel, your drive shaft is going around 3.55 times...so if you bump them down to 3.73's the wheel will spin faster at the same given RPM since the drive shaft is going around about a 1/4 more each revolution of the tire...

With 3.55s you are correct, one revolution of the tire=3.55 revolutions of the driveshaft. But, if you switch to 3.73s the tire will be spinning slower at the same given RPM. This allows you to get in the powerband faster (at a lower MPH)

 

[missouri_guy197]

With 3.55s you are correct, one revolution of the tire=3.55 revolutions of the driveshaft. But, if you switch to 3.73s the tire will be spinning slower at the same given RPM. This allows you to get in the powerband faster (at a lower MPH)

ahhh yes, that makes sense

 

[admdavs]

Is the transmission on the Cobra a T45 or T56??

 

[missouri_guy197]

03's have T56's...

 

[admdavs]

Is the T56 also on the '01 Cobra???

 

[BadAzzTT]

No, the 01's have the t45

 

[20Cobra01]

No, the 01's have the t45

No 99's have a T45, 01's have the T3650