727 Build for Mid-10s
Require a small hole be drilled into the front drum or the front drum piston. If you drill into the drum, oil will spray out of this hole directly at the pump vent and you will indeed have a leaking trans if the pump vent is not plugged. Also current NHRA rules require a puke tank on the trans. I moved my vent to the tail shaft and drilled and tapped for a fitting and braided hose right into a puke tank mounted on the pan rail.
Not necessarily required, but I had a fabricator weld a bung on my case which I drilled and tapped for external pressure adjustment.
Again not required, I cut a notch in the bottom of the bell housing
For easier access to check or tighten the converter bolts.
Also you could add the transbrake electrical connector now even if you don't use it. It requires drilling and threading the case, so why not do it now. I also drilled the small hole to get more oil the the roller clutch. Does it help, I cannot say. On a 727 you should put in the better hd pump gears especially on a 727. Note the stock versus had pump gear differences.
Some things for you to consider. Yes I would move the vent to the tail shaft. As was recommended in post #25 plug the vent in the pump. Are you sure you will never install a transbrake, because if you do, that calls for some mods as well. One of the reasons to plug the vent in the pump is that several transbrakes on the market
Require a small hole be drilled into the front drum or the front drum piston. If you drill into the drum, oil will spray out of this hole directly at the pump vent and you will indeed have a leaking trans if the pump vent is not plugged. Also current NHRA rules require a puke tank on the trans. I moved my vent to the tail shaft and drilled and tapped for a fitting and braided hose right into a puke tank mounted on the pan rail.
Not necessarily required, but I had a fabricator weld a bung on my case which I drilled and tapped for external pressure adjustment.
Again not required, I cut a notch in the bottom of the bell housing
For easier access to check or tighten the converter bolts.
Also you could add the transbrake electrical connector now even if you don't use it. It requires drilling and threading the case, so why not do it now. I also drilled the small hole to get more oil the the roller clutch. Does it help, I cannot say. On a 727 you should put in the better hd pump gears especially on a 727. Note the stock versus had pump gear differences.
