3 series ring gears are thicker than the 4 series ring gear.. This is why it won't fit.My old gear is a 4 series and the new one 3 series. But i can´t make it fit with a new spool. Becuase the pinion is moved in my high ratio case.
Did it even cross your mind to call them???? They sent you the gears, so CALL them instead of dragging it on here....Now i have more info. I had a 4.10 richmond PN 79-0011-1 4 series gear before. The one Driveline solotions sent me is a Motivegear D60-373 (2 series?). Motive have a gear with PN 708125-4 (4 series?). Could it fit with the other gear??