I have a '59 1/2 ton stepside with a 235 Thriftmaster, 3 spd on the column. Pattern is left up (Reverse), left down (1st), right up (2nd), right down (3rd). Yesterday it was shifting fine....today it wouldn't go into 1st gear....it would go into reverse and then 1st, just not into 1st from 2nd or 3rd. Any ideas? The clutch is fairly new.

Thanks!