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i have one of ron's pulleys. i didnt need a new belt. it helped pick my voltage back up at idle!:shake:23$ shipped.When going from the 105 amp to the 145 with an overdrive pulley you'll need to get a belt that is 1-1.5 inches shorter than stock. Now,I have had some guys tell me they didnt need a shorter belt and some have needed one.The only thing I can think as to why some do and some dont, is the condition of the belt tensioner.You can get the belts anywhere, Azone, Advance, napa, oreily.