Once you have studied the and done your repair, run through this checklist before closing the case:
On the official diagram, you will see small piston ports next to each clutch. If the tractor creeps or slips, check the seal rings on these pistons first. John Deere 4020 Transmission Diagram
On the diagram, look for the synchronizer cones (brass rings). Worn synchronizers are the #1 cause of grinding when shifting from 2nd to 3rd. Once you have studied the and done your