XDP Ford 7.3l Powerstroke Gear Reduction Starter

This fixed my dad's slow cranking speed, and subsequent failure to start even in warm weather!
It started first try this morning at 8 degrees, not plugged in!
Starter used:
https://www.xtremediesel.com/xdp-wrinkle-black-gear-reduction-starter-xd253
Thanks for watching!