Re: 4l80e rebuild
Alto makes parts for the direct,forward, and intermediate. Must be 4L80E specific. They have different part numbers for the TH400 stuff.
Alto does not have clutches for the overrun and overdrive. Raybestos has the clutches for that and they are blues.
On the front band, use the wider 1999 band and the longer servo pin and piston setup.
On the rear band, just use the HD anchored band that you can get at Transtar or Dacco.
BW makes the 34 element sprag.
Transgo makes the HD2 shift kit that is a must have for any kind of racing or towing.
You can get all of this stuff at Transtar except the Raybestos clutches. You'll have to get those from Transmissioncenter.net.
If there is anything else you need let me know. I may have the part numbers from all the goodies I put in mine.
No such thing as a billet servo for a 4L80E

That's 700 stuff.