This is an easy one: would someone explain to me the significance of converter stall speed. For example, I've got a TH400 w/ 3500 stall. I understand the stall refers to the RPM when two "things" start spinning at the same speed, what two things? And how is this related to cruise RPM, for example, why do I want my cruise RPM's to be greater than my converter stall speed? I know I can cruise at 2500 RPM's so what's the problem?? Thanks in advance.

Think if it as two fans facing eachother but blades are not at same angle on one fan. Both fans turn opposite directions. Say , one fan needs to spin faster to get other to "move" , this puts the driving fan in higher rpm ( motor) and then smaller fan (driven) moves later but big fan has more power within its rpm , thus multipling driven force? Make sense?

As for cruising at stall speed, there may be some slippage ( understand the above). Once past that speed, you will cruise with less slippage, especially with a 350 or 400 trans. Not the same with OD trans. I am not a transmission specialist but I did stay at Motel 6 over weekend.

Not fully following, although getting the idea. What, physically, does each fan represent? How is "driven force" multiplied, exactly? By slippage, do you mean "big fan" power is being used to bring "driven" fan up to stall speed versus being used to turn the rear wheels?

Big fan fin against the little fan ,, Think turbine. All of this basically get motor into the hp power and torque range. You live in Tenn, why not get TCI to explain this. Got to their web site, They may have more expert explaination. http://www.tciauto.com/converters/index.htm

http://www.tciauto.com/tci/research.htm