I am new to the site and in need of information. First off, Howdy everyone. I do not own a 5 ton yet, I am presently looking at a 1970 model 818. I have driven it and could not get the transmission into 4th gear without grinding. I tried multiple times with up shifting and down. Are these transmissions synchronized? I have not been able to find the real answer. Help here would be really appreciated. As long as I am asking, is there anything else I should really be looking for. Thank you, Chris