First off this is an excellent forum for Gen III GM V8 equipped vehicles.
Truck is a 01 Suburban 5.3 4WD LT Autoride
Yesterday I started doing some of my 100K maintenance work and got around to the transfer case and noticed it has a large allen plug for the fill. Naturally I didn't have that size and was wondering what size it is so I can get a wrench that fits it.
Also does the 5.3 have the block drains for the coolant like earlier model small block engines.

This is also posted under the performance section by accident.

 

I'm going to close this thread in here because I believe you already have responses in the one in the performance section.

 

Whoops, accidentally deleted my own post. Anyway, TTT!