International 826

With dual wheels,I wouldn't go more than a 7 shank,to get it in the ground where it needs to be to do a good job. If you have enough weight in front to handle it,I prefer a 3 point myself. It'll get you more traction.
 
I always heard a rule of thumb was 10 hp per shank, and that was pretty much my experience.

I pulled an eleven shank with an 856 and a 14 shank with a 1086.
 
Is it a chisel plow or V ripper? We probably have different names for them in different locales, but around here a chisel plow does it's work at the 7" to 9" depth, where a V ripper does it's best at 12" down to however deep you want to go without ripping up field tile.

I used to pull a 3PH seven shank chisel plow with the 1086, and I could pull it anywhere I wanted to at 8". Then I went to a five shank 3PH V ripper and found out the 1086 wasn't enough tractor in some of the tougher soils. It would just plain anchor the tractor to the ground and I'd have to back up to get it out. It was very unforgiving and hard on the tractor.

Don't know what kind of soil you are working with, but I would think you could pull a seven shank 3PH chisel plow at 8"-9" but you won't win any races. To pull a pull type chisel that will cover your dual tracks you might have to weight the tractor down pretty good.Jim
 
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