2001 4.0 auto
It has been 20 years since I started a freshly rebuilt engine,, but if memory serves me I should be keeping it up over 1500 RPM for the 1st 10 minutes?
Also typ having to set the timing imeaditly when it starts.
My other concern is the trans has cleaned and new Torque Converter.

So question is,, even if I fill the trans pan with fluid,, the TC is not "Full",, should topping off the trans be an initial priority or should I be paying attention to the engine 100%

 

Timing is controlled by the computer. If the distributor is installed correctly, you're good to go.
Unplug the CPS and crank the engine til you have oil pressure. Plug it back in and start the engine.

Search for cam break-in procedure.
Your trans is empty? Ya don't wanna be spinning the torque converter during the cam break-in procedure without enough ATF in the tranny. I would do a total fill on it.

 

I have an oil prime tool,, I ran the pump to make sure all lifters were putting oil to all push rods,, I'll prime it again just prior to firing it up.
On the trans I did a new filter, cleaned the pan, dumped a qt of fluid in the TC, after installing I put fluid in the trans, I was thinking the TC is not "Full" and would probably fill up with what is in the pan?

 

If you put some in the torque converter and filled the pan with about 4 qts, you should have plenty for startup. Once the engine is running without noise, just let it idle and check the transmission fluid level. Hold the brake and shift it through all the gears. You're SUPPOSED to check idling hot in neutral, but you can get it in the right ballpark even if the fluid is cold. Most important is making sure you have no engine noise or crazy leaks. Don't try to hold the rpm until that's verified. Once the fluid levels look good (shouldn't take more than a couple of minutes) then you can proceed to the cam break in procedure.

 

Thanks,,
Crazy how in my Teens I would pull and engine friday, rebuild it and have it back in and running Sunday,,( hand hone and emery cloth rebuild) and now in my 50s sweating every detail.

 

NO you never rev up an engine beyond an idle on startup until you see oil on ALL the rockers. FSM has a huge warning about this and frankly my dear its common sense.