I think you have something wrong with the shifter forks inside the tranny. You are going to have to split the tractor, probably (although I worked on my 100's tranny without doing so 'cause I couldn't get the pin out of the coupler. There will be just enough room to get the tranny cover off and look inside.) Then you can move the shifter around, check the shifter rods and see if the bolts are tight on the shifter forks. I suspect that a fork bolt loosened up and that is keeping you from getting into the other gears.
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John
Proud Owner of a Model 100 and a Model 124.
A homemade cart, 2 x 42" mower decks, a 38" deck,
a 42" front NF blade, and a lawn sweeper!
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