Seems like I saw some literature once upon a time that says that it's supposed to be synchronized, is this true? On my dad's old truck double clutching second gear is a must. It's not required on 3rd gear but you kinda have to feel it in there. If it is supposed to have synchro's, can they still be had?

Dad says it's always been that way, but I think he also told me that back in the day his dad used parts from 12 different transmissions to make one working one.

Also what about the rear seal? The transmission has a tendency to get dry, the fluid seems to leak out and go down the torque tube. If it's just a little dry you can park it on a downhill incline and the fluid will run back into the trans and it'll be better for a while. How hard is i this to replace.

Finally, what is the correct weight and type of fluid?