Yes, you can go here:
https://www.tciauto.com/speedometer-gear-calculator
Gear on the output shaft has 7 teeth, this is the DRIVE gear
ratio 3.73
Tire 35
Comes up with 15 tooth driven gear
Not sure they make them but someone might, Fords only go down to 16 tooth
I think you can get replacement DRIVE gears for the M5R1, an 8 tooth drive gear would put you up to a 17 tooth driven gear.
Sorry, you have a transfer case, so DRIVE gear is on the transfer case output shaft, and yes you can get 8 tooth drive gears for those
You need to remove the drive line and flange from transfer case and remove seal, then slide the old 7 tooth gear out and slide the new 8 tooth gear in
Then a new seal and replace flange and drive line
The flange NUT can be a bear, 150+ ft/lb torque spec, and not all sockets fit it, 30mm thin wall