You're right; you'll have to tear into the rear end. It's not that bad a job though. Poke around in here and you'll see other notes how it's done and some images too. It goes something like this: - obtain gasket for trumpet - drain the hydraulic/transmission fluid from all three places - take off the left tire (as viewed from the seat) - take off the left fender - Use something like a couple of slings off of a come-along attached to a rafter to support the left hand trumpet. - unbolt it and use the come-along to lower it - inspect washer/gasket on the inside of the pin for wear. - inspect pin for wear. - If either are needed, replace. If not needed re-torque. - Remove ring gear; it just pulls out. - Repeat inspection, etc. for right hand pin. - reassemble and fill with oil - I removed the PTO shaft; don't recall if that's necessary or not. If so, you may want to get a new gasket. If your lift is working fine, then the only thing you may want to do while you have the fluid drained is clean it out. I had my lift cover off and the pump dropped so I really went at it. You may just want to follow Zane and Andy's advice in earlier posts for cleaning it out with kerosene. I've heard that the more these pins get loose, the more wear/damage that occurs to the cast iron socket for the pin. So correcting the problem sooner rather than later might be a good thing.
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