1980 4spd will be the SM465. The adapter will have mounting surfaces that both resemble a figure 8. Round style mounting adapters didn't start till they switched from 10 spline output to 32 spline output and went to the aluminum 208 T-case in 1982. Those 10 spline units used a sleeve to connect the transmission output to the transfer case input. The splines were notorious for wearing so bad lots of them stripped completely out. The sleeves are rather cheap. Be sure to put a new sleeve in if you have more than a tiny amount of slop in the splines.
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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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