Does it ever work ? I really dont know would help if I could- call the dealer and ask for their oldest mechanic! :)
 

I think cab mounts will fit fine depending on 4020 being early or late model filler plates may be a little different. Back when I was employed at a dealership I supervised/assisted mounting Hiniker & Year-around cabs on JD & IHC tractors
 
The only issue might be the filler plate that fits across the hood under the front window. A 4320 is slightly taller than a 4020. Depending on the brand that piece is usually slotted or has different bolt holes for that issue. If you are going on an early 4020 you will need to make some panels where the side console went on the 4320. Tom
 
(quoted from post at 16:45:53 10/19/19) I am wondering if a cab off a JD 4320 will fit a 4020 without modifications?


As other stated yes it will.
I have a Hiniker cab that was removed from a 4320 and I installed it on my early 4020.

Had to make a filler piece around the cowl.
 

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