Depth will make a big difference and the type of shanks [twisted are usually on Glencoe Soil Savers].Most 4320 are around 120 H.P+.The 34 in rubber doesnt give the traction of 38s so I would say nine shanks or less would be about right.Anything larger and slippage would be an issue.They work best at around 5 M.P.H.+.I know they make them in seven but I havent seen many.A lot of good older equiptment went to the salvage yards for scrap.The addition of MFD on the 50 series made a 125H.P. tractor pull the same load as a 150H.P.+ 2 wd.Slippage in excess of 10% is wasted energy.I have seen 14ft. chisels behind 4020s but they are only going about 6in deep if that.
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