The TH400 is probably "the" easiest-to-overhaul automatic there is. All the clutches in the front, all the gears in the back, and no pistons in the case. Maybe the worst part of the whole assembly is getting the forward clutch to engage with all the direct-clutch plates.
Make sure the one-way clutches go back together correctly--spinning one way, locking the other way, but both ways CORRECT DIRECTION.
I'd install a TransGo shift kit. Be prepared to MAYBE install a governor tuning kit once the trans is back in the vehicle and tested.
The ones I build, I plug a certain hole in the valve body, and leave out a seal in the Direct clutch, so that both chambers of the Direct clutch piston apply area are used--more surface area, firmer hold on the clutches. "I guess" the same thing can be done by leaving off a sealing ring on one of the shafts...but I've never researched that.
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