4.10 Gears

[jftaro]

I am thinking of either 3.73 or 4.10 gears, leaning more towards 4.10's. This is my daily driver so wanting to get some input from 99 Cobra owners with T45 tranny. What kind of RPM's are you turning say at 60, 70, and 80mph? Any other input/suggestions are welcome as well. Thanks.


Jeff
99 Red/Tan Vert.

 

[GodStang]

RPM = (MPH)*(Gear ratio)*(336)/(Tire Diameter) 4th gear
RPM = (MPH)*(Gear ratio)*(336)*(.067)/(Tire Diameter) 5th gear

 

[99SVTAddict]

I had 4.10 gears with my T45....was a nice gear but started thinking I should have went higher...so I did when I put in the new tranny and rear end.

I can't remember RPM...but it was no big deal. 70MPH was around 2600RPM if memory serves me...or 2800.:shrug:

Go 4.10 without even breaking a sweat....think about the 4.30's though (there's only a 5% difference between the two gears).

 

[jftaro]

Thanks for the info 99SVTAddict and I will think about the 4.30's

 

[TNstangman]

If your going to stay N/A, DEFINITELY go with 4.10's. I was worried too when I got mine, but you will appreciate it greatly!

Then go get a chip to fix the speedo and get a few extra HP while your at it.

 

[CY98Cobra]

i have 4.10's for sale if you are interested.

 

[CY98Cobra]

oh yeah brand new frpp you can email me at [email protected]

 

[cobra29]

4:10's is good but 4:30"s is really good. If you don't get a chip, get the speedo cali. from dallas mustang. It took me about 20 mins to put in by myself.

 

[CobraGirlSVT]

Take it from someone who has had both 3.73s and 4.10s...

GET THE 4.10s. I daily drive mine 25 miles each way, in L.A. traffic.
No regrets. I wouldn't shy away from 4.30s but wouldn't go any steeper than those.

 

[BlueStripe]

3.73 - 2324 rpm
4.10 - 2554 rpm
4.30 - 2679 rpm

http://www.geocities.com/z_design_studio/transmission_z28_6.html

Bookmark that site if you want to play around with it some more. Make sure you change the tire size, redline, and transmission gear ratios, as that calculator is defaulted for a stock Z28