Get rid of the original 10MT starter on your John Deere 4010 or 4020 and never worry about starting problems again with this super heavy duty diesel starter converted to gas. 30MT will give you enough starting power to get your tractor going, even on those mornings when you didn't plug it in! The $400 includes a $50 core which is refundable when we receive your old starter. Core needs to be sent back in 30 days from when you get the new starter in order to get your refund. All starters carry a 1 year warranty. Ships in 3-5 business days!