I would not go with the 4.56.
You didn't say what size tire your running?
I would think probably 9.00-20 and with 4.56 ratio the motor is not
Going to like it when loaded or empty on a hill.
I would try the 4.88 ,or most likely the 5.29
Tire diameter play's a big part if final ratio.
My MT80 (C80) with 427,5 &3, 3rd being OD pulls good until I come to a hill.
Even empty at 18,000 I have to shift back to direct to pull it.
That's with 7.17 ratio and 10.00-20 tires
My .02
Tom
