Cascade Crew

91camaro_rs · Posted: Sun May 31, 2009 10:28 pm Post subject: gear change

im upgrading rear ends, i will have a 4.10 gear ration so what new speedo gear do i need for my tranny?

blue89 · Posted: Mon Jun 01, 2009 6:20 am Post subject:

15/45. As far as I know, they don't make the right one, you can only get close.

Twilightoptics · Posted: Mon Jun 01, 2009 6:24 am Post subject:

What tire size and what drive gear is in what transmission?

91camaro_rs · Posted: Mon Jun 01, 2009 11:55 am Post subject:

my tires are 245/45/17 and my rear end is 3.23 now, and i have no idea what gear is in the tranny, all i know is that it is a olive green color, and its the stock one.

blue89 · Posted: Mon Jun 01, 2009 12:30 pm Post subject:

http://www.miata.net/garage/tirecalc.html
25.7" tire

http://www.transmissioncenter.net/speedometer_calibration_______va.htm
If your speedo is correct, then you should have an 18/45
When you put the new rear gears in, a 15/45 will get you close but you'll still read about 6% faster. That's the trouble with 4.10's in our cars with stock sized tires. The Transmission Center sells the stuff you need to get it changed over.

Quasi-Traction · Posted: Mon Jun 01, 2009 12:35 pm Post subject:

This is the one I used when I went from 3.73 to 3.42

http://www.bgsoflex.com/speedo1.html

91camaro_rs · Posted: Mon Jun 01, 2009 12:48 pm Post subject:

Twilightoptics · Posted: Mon Jun 01, 2009 2:50 pm Post subject:

What transmission is this?

It's a 26" tall tire according to TCI.

I don't understand how you guys are figuring this.

Are you saying your speed driven gear has 45 teeth and you're only changing the drive gear?!

91camaro_rs · Posted: Mon Jun 01, 2009 9:51 pm Post subject:

well i wouldnt worry about it anymore, i was supposed to pick up the rear end tomorrow but he just told me he sold the whole car...dang it