I have had a couple of these units apart. one chevy and one GMC. I know the Chevy has 6 bolts but I do not remember if the GMC had a 4-hole flywheel for the Hydramatic.
Yes, the military did have Hydramatics in use in many rigs including tanks grin
http://www.futurliner.com/trans.htm

http://www.drivetrain.com/transautogmapp.html

http://www.autotran.us/hmkits1.html


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Be yourself. If you are ever lost, It will be much easier to find yourself if you know who you are!