start up in park or neutral ?

I've been doing the same as you particularly after sitting all winter in frozen upstate New York. I wait until the idle comes down from high before shifting from Park though.
Sorry if I've already asked, but where in NYS are you? And upstate means different things to different people LOL.
 
Sorry you feel like you have to "defend" yourself, as my purpose wasn't to attack you but to clear up information. I'm a blunt person, which often doesn't come off as I'd like in written American communication. It's likely one reason why I and the German-American and Australian-American people I know get along so well. :)

I appreciate your perspective on the pump not doing much work in park at idle (around 5 psi,) and at the OP's 2K - 3K rpm it will be pumping well at around 30 psi.

As for your preference to start a rebuilt transmission in neutral, there's nothing wrong with it since (1) it won't hurt anything and (2) it's your transmission and you may do as you please. I took your recommendation to be more of a universal "it's the right way versus the wrong way," so my apology if I read something else into it. I think you'll find most Mopar factory service manuals assume the overhauled 727/904 will be started in park and don't lay out any special instructions for putting it into service. The 1960's and 1970's factory TF 727/904 manuals I use never mention starting in neutral, although I've seen generic non-make-specific aftermarket instructions (e.g. TCI) specify lifting the wheels off the ground and starting in neutral.
It's no big deal... and I've been accused of being "blunt" myself. Just wanted to show we're really all on the same page, trying to give the best advice we can. I learn things all the time... Some things I've been doing the hard way for years.
 
It is a good idea to start the transmission in neutral to fill the converter up quickly. Yes, it will still fill up in park, it will just take longer. Probably not an issue unless the converter is dry to start with.

Dave
 
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