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What you need to do is "borrow" the 300 from the truck, install it into an F600 or F700 Chassis, and try again. The 300 will do it, but the F-150,250,350 chassis might not, even as great as they are.
lol you guys are great...the stump is about 1 1/2 feet in diameter..i couldnt even budge it with my dads kubota with the diff locks on in low range if that tells you how stout this stump is..
I have a 1979 f150 4x4 300 Cid, b&w t18b transmission (4spd), 205 transfer, 9 inch rear and Dana 44-7f front axel, 3.55 gears and in low granny 4low I have pulled several oak stumps out of the ground with it. Had to load it up with weight because the tires just spun with out it.
I have even tried to make it a submarine once Crossing the river while stationed in Alaska. Thank God for rubber floor mats. Not knowing there was a hole in the Crossing I wound up with water coming through the driver door window