D7G seial # question

The local Fire Dept. has a quarried a D7G and I finally found the serial number plate but not on upper left rear end of transmission case. It has a # of 4YB00010 and is a USMC tractor with the word of Air Force across the top of the back of cab. I was told it was a 75 but on the plate it says 1982 and delivered in 11-83. My old cat book of serial numbers only goes to D7F and my CAT book don't have a 4YB in it. What gives? catskinner

4YB is the S/N prefix of the 3306 engine powering the tractor - it is not the tractor S/N. The D7G was manufactured from 1975 to 1987 in the U.S. and continued to be manufactured in places such as Indonesia and Japan until 2005.

Hi Team,
scan below should help with the Mil. S/No Prefix vs. Civilian Serial Number, Literature etc.
Cheers,
Eddie B.