I was just talking about changing the GQ double lock nut and lock washer system to the GU system which is a lock washer with lots of holes drilled around the circumference. The lock nut also has a pair of holes. Lock washer on first, stub on the inside edge of the lock washer grabs a groove (or two grooves, can't remember) in the spindle. Do the lock washer up to the right torque. Install two machine screws through the lock nut and into the appropriate holes in the lock washer.
I have not converted mine, others have - can I suggest you do a search and see what comes up - or post a new thread with the right subject in the appropriate mechanical discussion, and see what advice turns up.
As to converting the whole diff, apparently GU cvs are bigger etc - again I think a search on here might reveal all.
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