641 will tote a 5' or 6' hog. 5' thru anything.. 6' thru just about anything.. though you can always take a smaller bite or use low gear.
I run a 5' in 7' weeds in 1st gear and max throttle on an 8n.. and my 00+ use a 5 or 6 with neary a problem.
yeah.. DO use an ORC
someone will be along to quote the manual with speeds.. you got oe 12.4-28 tires?