I just did a gear swap in my firebird, from 2.73 to 3.42.

What exactly do I need to do to make the speedo read correctly?
It's the electric one, not cable driven.

Do I need to change the gears in the tranny, or do I need to change something in the speedo itself?

The car is an 89 formula 350, the wheels and tires are stock sizes, and the tranny is a stock 700r4.

I've asked several mechanics and all I get is a lot of head scratching and dumb looks

I also searched the archives, and there is so much information in there I started to get confused.


Thanks for any help
John