There were a few sites with this kind of calculators, specially for Ford's trucks. Lost the link information when my last computer died.

Anyone out there with the links?

Thank you in advance for your help.

 

Found them. Thank you for all the replies.

 

Mind sharin?

Adrianspeeder

 

Sorry for being late but someone opened my mailbox and I lost track of some messages including this one.

Speedo Gear Calculator sites:

http://zenseeker/4x4/speedo.htm

http://www.midspring.com/~steveflyer...ear_select.htm

http://home.mschi.com/~jroal/drive.htm

www.differentials.com/calc.html

Some will be a better fit for our trucks. But I save all for now.

Hope it helps.