speedo correction?

I changed over my rear axle from 2.41 to 3.73. Now I have no accurate speed available.

I purchased the larger speedo drive housing and the 2 inch housing plug. I have a couple of larger gears to be used.

But what about the output shaft gear? With 28 tall tires and 3.73 gears, what's my choice?

Any help here.

This site has all the information on what combo of drive/driven gears for our 350/700R4/400 Transmission
when we have gear changes.  This is for the 2 inch speedo housing on turbo 350 and the other transmissions.
:-)

http://www.73-87.com/7387garage/drivetrain/speedo.htm