M4700 need hydraulic lift rod gear box or replacement right side

[banjerpicker]

My gearbox on my right side hydraulic lift is not working well. It is kinda grinding as I lift or lower plus it looses all the grease thru the zerk when I am lifting with it. New one from Kubota is over $500.00 even if they have them. Anyone got a suggestion on a 3rd party replacement arm? Thanks, Larry