Posted by BillS on March 27, 2012 at 10:21:32:
In Reply to: Differential lead ratio posted by Raj on March 25, 2012 at 22:30:05:
I've collected constants for two David Brown MT-xx:
http://www.meshingwithgears.us/faq.htm#(h10)
If these don't work for you - 60, there are ways to find your diff formula.
Look at the other FAQ topics, or at the Articles by A. Lehman. He has written 2 articles dealing with finding diff formula for new machines without documentation.