10 1/2 for a total fill.
Installation of countershafts
No, 10 speed does not convert over. You would need to get a truck with either a 13 speed, or a 9C transmission (which is convertible).
I've never heard of an Eaton Fuller 12 speed, nor am I able to find any references to one via Google. I've driven Eaton Fuller 8LL, 9 speed, 10 speed, 13 speed, and 18 speed transmissions - could you be thinking of one of these? IIRC, Volvo marketed a proprietary 12 speed transmission, and Meritor offered a 12 speed automatic, but not Eaton Fuller.
The words "Super 10" refer to the Eaton 10 speed heavy duty manual transmission.
Mary Eaton died on 1948-10-10.
Yes, there's a transmission filter.
Frank Eaton was born on 1860-10-26.
Brian Eaton died on 1992-10-17.
Amos Eaton died on 1842-05-10.
You can fill 10.67 (11 rounded up) 6-ounce cups with 64 fluid ounces.
You fill it until it runs out the fill hole on the side of the transmission.