Basically the same way an automotive automatic transmission does. Hydraulically applied wet clutch packs engage and disengage to route power through different gear trains. The different gear trains (generally planetary sets) are constantly in mesh therefore no mechanical mesh or teeth clashing takes place to provide the different "gears". So that description covers a full powershift. The IH TA works a little different as it relies on a one way clutch to take the load from a reduction planetary gear set in the low range. A straight through direct lock clutch provided the hi TA range. I think the one way clutch may have also been used for the under range in the Oliver. I'll let someone else explain that in more detail. Have you ever looked up the "how things work website"? It explains the workings of many things such as an automatic transmission in pretty good leymans terms.
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Today's Featured Article - Good As New - by Bill Goodwin. In the summer of 1995, my father, Russ Goodwin, and I acquired the 1945 Farmall B that my grandfather used as an overseer on a farm in Waynesboro, Georgia. After my grandfather’s death in 1955, J.P. Rollins, son of the landowner, used the tractor. In the winter 1985, while in his possession the engine block cracked and was unrepairable. He had told my father
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