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Earl: Been awhile, hows the fall in Il, wee bit dryer than here I hope. I'm trying to do some plow testing, problem with this rain, I have too much time on my hands for adjustments and not enough time to see if the adjustments work. The No. 70 was 3, 4, 5 or 6 bottom starting in 1958, 14" or 16" bottom. It later became the 700 and went as high as 8 bottoms. I have an IH dealer parts book that gives a listing for 3 & 4 bottom and another for 5 & 6 bottom. I haven't looked in detail but expect there must be frame difference. IH do the same with the 60 - 2 & 3 bottom and a 3 & 4 bottom. the first one describes the 3 bottom as reducable to 2 and the second describes 4 bottom as reducable to 3. I don't see anything suggesting any of the 70s were reducable. The major difference in the 60 and 70 is frame size as it applies to clearence, both vertical and horizontal Vertical is around 26" on 60 and 30" on the 70. Horizontal is around 21" on 60 and 24" on 70. Some books will call that a bit different. I had a 4 bottom No. 60 plow and had a neighbor with a 70 4 bottom plow. Side by side the size was quite noticable. The two plows used the same trip mechanism in the trip beams, although a few of the early 60 at least had trip hitch rather than trip beams. Both plows used the same bottoms, but watch out for early models as they may have Plow Chief bottoms. IH only used those about 2 years, thus there are not many wear parts available. Plow Chief has the two piece point and share. You don't want Plow Chief anyhow, believe me I had one, trouble, trouble, trouble. The points will not stay tight. The Super Chief bottoms were far superior, came out around 1960, and every IH and CaseIH plow I've seen since still uses them. CaseIH may well be still using Super Chief bottoms, not a lot of new plows in the past 10 years, to be sure who's using what. I can assure you one thing, if it's Super Chief parts, they are still front row center at CaseIH parts dept.
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