[gfercaks33]

when i install my gears and my posi will i need to calibrate my speedo? if so how do i do this

 

[Lugnut79]

Chances are good you will have to if they aren't the same ratio as you took out.

Check out this website. It will tell you everything you need to know

http://www.novaresource.org/speedo.htm

 

[DANNO]

Here's some info:

http://www.transmissioncenter.net/speedometer_calibration_______va.htm

http://www.tciauto.com/Products/TechInfo/speedo_gears.asp

 

[gfercaks33]

im going from like 3.08 to 4.11

 

[Lugnut79]

That Nova Resoures link is great. I followed the charts on it and got my friends 69 camaro Speedo within 2 MPH of my GPS.

 

[tnblkc230wz]

You can call the www.gearbox.org. Tell them what you have and they will tell you what you need. The plastic gears are about $11 each.