I went to a machine shop and he told me that while he could repair the dog teeth, he couldn't harden the metal all together (using quenching), as they are two different metal alloys and can't be "glued" together properly. So i contacted Passon Performance and American Powertrain Warehouse to get a new input shaft, a new 3rd speed gear and a new synchro assembly. What i found weird, was that the 3rd 4th synchro rings were in nice condition, whereas the 1st 2nd synchros were shot and 1st 2nd dog teeth were a little worn out but the gear were shifting ok, except 2nd downshifting, i have to get it at 15 mph to do it! Not to mention that metal particles were glued all over inside the trans. Anyway i cleaned and painted everything now and i'm waiting for the parts to arrive.