Speedometer recalibration

[FOOSE]

Hello,

I'm wondering if anyone knows if I can get some sort of device to recalibrate my mechanical speedometer, I'm building an '83 Chevrolet Silverado with a 700R4 tranny, for now i'll stick with the factory gauges, but I changed the gears to 4:10 gear ratio, the truck is not drivable yet so I can not test drive it, any info will be much appreciated!

Thanks

[pholliday1]

is this 2wd or 4wd?

[ehjorten]

There are speedo gear-ratio adapters such as the ones found on this site:
http://www.transmissioncenter.net/speedometer_calibration_______va.htm

You can change the driven and drive gears for the speedo or you can sometimes add an adapter.

[FOOSE]

Its a 2wd and i'll have 22" wheels in the back and 20" in the front, the tire size in the back will probably be 285/40/22, making the tire about 31" in height.

Thanks ehjorten! that site helped a lot!!

[Fairlane514]

These are good people do deal with...

http://laspeedometergear.com/