you don't *have* to have the same ratio front and back for the truck to work in 2wd. also, if you drive off road exclusively, where the terrain is loose and will permit tires to slip, that would be ok in 4wd. however, if you put it in 4wd on pavement it won't be pretty. something will break, unless your tires can constantly break loose.
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1969 GMC K2500 
1996 Honda Accord
2007 Kawasaki KLR 650
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