1/4-28 for the zerk thread. Replace the one on the left (passenger) front side idler arm with a right angle zerk . Just did it this weekend. That zerk is a hidden one, and impossible to reach with a straight on grease cupler. Air grease guns are good. Just get the kind that continuously pumps grease while you hold the trigger. Others you ahve to pull the trigger each time to dispense grease...annoying.
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