It is probably is as simple as the 30 series was on the way.
Remember, the 4520 was introduced in 1969, 4 years before the 30 series. THe 4620 was an improved 4520 (added intercooler, altered air cleaner, new number as the 4520 got a REAL bad wrap real fast). The 4620 PS required no new parts that weren't already designed.
The 4000 was the same... it was essentially a 4020 lightened up.
The 4320 was a design that required some new parts... the dash etc would have needed to be redesigned to accomodate the PS transmission., as those components are not the same as a 4020.
The 4320 was introduced in 71, with an engine very similar to the 4520 of two years prior.
Looking at production numbers in the early 70s, syncro usually out sold PS by two to one, perhaps closer to 3 to one. I can understand why a horse to be in the line for 2 years or less wouldn't get the option.
Consider this, too- Deere had a PS in a scraper tractor that used a 531 engine. Yet there is no PS 5020 or 6030. The 4320 wasn't alone.
And I am not certain, but I don't think there were PS 4030s either. The PS from a 3020 probably would've worked...
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