I just noticed today that my stock 3 speed is starting to grind more and more when downshifting from 3rd to 2nd. It used to work fine and any speed, but I need to be going much slower now to get it to downshift without any grinding. I am assuming that the synchro is worn. I have no desire to really fix this tranny as I am getting things together for a SM420 replacement. As long as I can live with the slight grinding is there any reason that I should be concerned about this?