That's really cool! When I had the pioneer 700, I had the track width widened by approximately 2 inches per side and had a 3 inch lift kit. The machine was still geared to high with 28 inch tires so these gearboxes while expensive are actually a wheel spacer, lift kit and gear reduction all-in-one.
The only concern I have with these gearboxes is they will add a twisting force to the A-arms that could exceed what they were designed for. There have been many members of this forum including myself that has had the A-arm mounts tear from the frame without running these gear reductions.
If I still had the pioneer 700, I would probably take a serious look at these but also beef up the A-arm mounts at the same time.
Thanks for sharing.