April 26, 2019 at 4:44 pm
#67238
Do you have the shifter attached? If you do, the synchro transmissions have reverse all the way to the right and down. Non-synchro has reverse on the left side.
Synchro pattern:
http://wp.mhartman.net/wp-content/uploads/20150608-002-gear-shift-knob.jpg
You should also find a date code on the side of the gearbox. The date can help identify which series the gearbox was for.
Mike