Thanks, I'm going to quote from that thread for others:
</font><font color="blue" class="small">( Here's a more complete list of differences. The 425 has:
3 additional HP
ROPS
Higher torque wheel motors with matching larger capacity pump to supply them
8" additional lift height
8 " longer wheel base
longer overall length
larger engine compartment easier to work on
2 articulating pistons (only 1 on the 422)
"beefier" articulating joint
more leg room
steering wheel and joystick are higher
larger oil cooler
different hydraulic oil weight
a few pounds heavier
)</font>