Built 4t65e - The results are in.

[BillBoost37]

but with Loctite, fine threads and an interference fit, it would take a LOT for those screws to back out.
Are the grooves in the sun gear for lubrication?

Might help if I told you I tore up 2 setups that were screwed with loctite and I tore up one from TEP where the holes are drilled smaller in the gear. I was evil to the trans and had some power. Most would tell you it wasn't enough power, however ...I pretty much mastered it since I have pics of at least four times that I did it.

I believe so on the sungear.