The American 60 used the Oliver 1550-1555 transmission and rear end. The American 80 used the 1655-White 2-70 transmission and read end.
The one big problem with the 60 was that the 1550-55 didn't have a differential lock. They tried to put one in the 60 by changing something in the pinion,don't remember just how it worked,but the early ones leaked in to the brake. They came up with an improvement and update kit,but they also drilled a hole to drain the oil out just in case. But so far as I know that was the only weakness.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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