Assemble the trans standing on end. When you get to the OD band, put it in place and install the servo right away.
If you finish assembly of the main case and lay the trans on it's side to put the servo in.... you will find that it is very difficult/tricky to get the servo pin to engage the band properly. (it can be done, it's just easier to do it NOW)
Install the servo while the trans is standing up (before you put the Int clutches and pump in) and you can look in and positively see the servo pin engage the band.
Put the servo in later and it becomes a bit of a guessing game whether or not the servo pin engaged the band properly.
Take extra care with the valvebody. These VB's are finicky as hell. Proper torque on the bolts is a MUST!
We call them "potato chip" valvebodys cuz they are so thin and will warp if you look at them wrong.
Warps and un-even torqued bolts lead to sticky valves and all kinds of problems.
Here's one that trips up even the "experts"... The filter is held on with 3 small bolts. 2 at the front and one at the rear.
The front bolts are ok, a slight over torque won't hurt anything.
The rear bolt is right over a valve and overtightening that bolt warps the VB and causes the valve to stick.
Trouble is.... the filter metal case tends to "squash down" when you tighten that rear bolt, and feels really "spongy" while torquing.
Because of this... guys tend to crank down on the bolt cuz it feels like it's not tight.... so they crank down until it DOES feel tight. (they are compressing the metal of the filter case). Now the bolt feels tight and all is good.... or is it? Probably too tight....
Here's what I do... I crank the bolt down to compress the filter metal case and get rid of the spongy feel to the bolt. Then loosen it and re-torque to spec. Now it doesn't feel spongy cuz I have pre-compressed the metal filter case, and the torque comes up real nice.
EDIT; When inspecting the VB... Look CAREFULLY at everything. These VB's are known to have broken clips and valve springs. When small parts break, sometimes its hard to spot, and the tiny little broken pieces can jam a valve and be very hard to see.
This is not the easiest VB to work on. Getting some of the valves out can be a nightmare. The aluminum end plugs get burrs on them and will refuse to come out of the bore. Then you get a really big screw driver and just pry that sucker outta there... NOT!
The aluminum will gall and the plug will wedge itself in the bore, and if you do get it out, there will be big gouges and .... not good.
Be very careful with the VB.... it's kinda delicate....