Re: 4r70w shifting problems
I don't know much about these modern transmissions but I do know that when a transmission (or any machinery) is malfunctioning, the last thing you want to do is go for a test drive. When you noticed the lack of reverse then you should have gone back to the drawing board. Serious damage usually occurs when a malfunctioning auto trans is driven. That neutral-like phenomena while in "D" could be the clutches or a band slipping badly,generating loads of heat and ruining the friction material.
I realize this isn't much help.I noticed there were no responses yet and I needed to exercise my fingers.
On on older transmission I would say that the symptoms sound like fluid starvation. Pick-up not installed correctly,clogged filter,low fluid.
If you were noticing less or more fluid going back in than you took out then you need to find the cause. I don't know about air bubbles. I do know that if fluid drained out of the torque converter and you just replaced the fluid that was drained from the pan,then you would get the lurching,slipping that you describe. You should of course check the level after going through each selector position (engine running) a few times while parked with the brake on.
I'm not at all familiar with the kit you used.I just know that at my age I wouldn't necessarily trust myself to do such an install without screwing something up. Go back and carefully review your work.-Brian
2001 Grand Marquis LS, 25K miles mint (edit; now 56K miles) Finally a vehicle with NO LEAKS !