Here are a few pictures to help you out with the unfamiliar 4420 and 6620 JD's.

I had a 4420 and traded it in on the 6620 Titan II 

(4420 4.JPG)

(4420 5.JPG)

(4420 1.JPG)

(4420 & 6620.JPG)

(PA040008 (Medium).JPG)

(PA040043 (Medium).JPG)

4420 4.JPG (51KB - 461 downloads)

4420 5.JPG (46KB - 431 downloads)

4420 1.JPG (68KB - 437 downloads)

4420 & 6620.JPG (59KB - 424 downloads)

PA040008 (Medium).JPG (80KB - 438 downloads)

PA040043 (Medium).JPG (80KB - 402 downloads)