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Okay I guess no one is open on Sunday's that has a press to press the pinion bearing onto the pinon shaft so that is getting done today and since I'm unavailable almost all week I think my buddy's dad is going to finish it today or tomarrow and I'll be giving it hell by Friday, lol...
I'll answer since everyone else just skipped you right by. Its a different gear ratio for the rear end. Taller gear = faster out of the hole, like a ten speed bike, starting off on the tall rear sprocket is easier to get moving.