I have decided to go with a TH400 for my Bad Ast project. I can't find an OD auto that will live behind the 509 that I can afford. The 4L80E is about the only viable option and I just can't afford the electronics so, I am going with a "dinosaur" trans that I can build affordably. The light at the end of the tunnel is a Gear Vendors Unit. I will save my pennies and do that in a couple of years.
Any advice on the 400? What should I have done to make it live behind a 550 horse BBC? Any local vendor recommendations. Flint or Livonia, MI. areas.
Thanks
Mark

 

I don't feel the GV would be as good as a 4L80E with lockup. The lockup ads just as much drive-ability as the OD.

 

Manually shift the 4l80e?