ok i have 12v and trans out of a 96 dodge 3500 in a 68 2wd c10 and i want to build a auto with a maunal valve body whats the up's and down's to it..... i have drove a common rail cummins and its alot of fun, this will not be a daily driver. mostly weekends at the track and a few lights to lights, i was told it wont last long good but the trans shop said they will build it and i just want to know what Im getting into i dont know anything about transmissions so teach me.