i ended up running the green xxx4? belt with a xx4 center and rear diff pulley with the lesro one way up front and my drivetrain was golden all year long. the best thing i did was use two idler pulleys and i made a idler bearing that kept the belt on the center pulley. that allowed me too run a looser belt. the stock stuff may work fine but i trashed two complete stock drivetrains, until i ralized my chassis had a flaw in it that let the spur gear run crooked. after that i decided to run the wider belt.
jim mann
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