The post below got me thinking.
How much was a non-turbo'd 6030 new in '73? How did it compare price wise to a 4630 at the time? The 4630 would have been similar or more HP, had more transmission options, and a lot nicer cab.
Being the 4620 really cut into 5020 sales, it amazes me Deere even offered the non turbo option on the 6030.