727 Problem
I have a 70 Dart 340 with 727.Had the transmission rebuilt about 3000 miles ago,The problem I'am having is after it sits a day or so I go to back out of garage and when I put in reverse it takes 30 seconds or so for It to move like it has to build pressure then after that its fine other then that the trans works fine.I have heard this is called morning sickness.What causes this and can it be fixed in the car.Its not a big deal but would like to know what my options are Thanks..
Here's the deal.
"Morning sickeness" really only applies to transmissions that have old rubber seals that need to warm up before they flare out and seal.
In your case the converter is likely draining back into the trans when it sits caused by sloppy fitting converter bushing in the pump and worn pump gears.
The loose tolerances let the fluid run back into the trans.
(If the rest of the rebuild was done right)
If it wasn't the problem could be worn sealing ring surfaces, bushings and/or they didn't replace the lip seal on the reverse servo.
Most builders won't replace a pump if it isn't actually damaged but just normally worn some.
Putting the thing in neutral for a couple of seconds allows fluid to circulate unlike in park, so the new manual valve mentioned does allow fluid circulation in park and fills the converter back up as soon as the engine starts.
The REAL actual fix is to put in a new pump with new pump gears, new bushing and depending on converter hub wear a new converter.
(Just put the new valve in the valve body and let it go at that.):D
The TF2 shift kits come with that valve in case you are interested.
