I am also interested in getting gears cut.
I agree that changing diff ratios helps but it also turns first gear into a waste of time so I also think a gear ratio change should go hand in hand with it.
The big problem with 60series boxes is the one piece countershaft so it either needs to be completely replaced with a splined shaft/gears setup or the old gears machined off and new ones welded back on.
All very $$ but I figure if guys are spending $10k+ on a CA swap, why not throw the same amount at an A series driveline..
