possible downshifting issues????

My 4 speed ( non OD ) had some issues when I got it. I had to replace 3rd and 4th gear. Also replaced the brass stop rings and all bearings. It upshifts great, downshifts from 4th to to 3rd very good. When going from 3rd to 2nd seems like I have to slow way down to get it to go in. At what speed should it downshift in 2nd from 3rd.