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Message: <blockquote data-quote="Jrgunn5150" data-source="post: 297177" data-attributes="member: 9682">Re: The Torque Converter Thread  "PLEASE STICKY"I'll be in here later to tell what I know <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick Out Tongue    :p" loading="lazy" data-shortname=":p" />imp2: Cuz I'm a snitch, lolOk, first off, How it works - The easiest way is to imagine two fans, just regular desk fans. Now imagine pointing them at each other, about 1 inch apart. Now imagine turning one on... Slowly but surely the other fan blade will spin up, until eventually they are going effectively the same speed. This is how your converter works (very simply, if you know in detail don't poke holes in my example, it's close enough). Now then, the fan that isn't on will never really go quite the same speed as the one that is. There will be a loss between them. The same loss is present in older converter's, and in non lock up modern converters. This leads to heat and reduced eficiency, which is why lock up converters where invented. Effective, in 3rd and 4th gear's, they lock the one side to the other, making sure all power get's transmitted. Fuel mileage goes up, and drivetrain loss goes down.Stall Speed - This does not mean that you need to rev your car to 3200 rpm or whatever it is before it will move. Stall speed is simply put, the speed when the front of the converter (engine side) and rear of the coverter (trans side) are moving the same speed. Now with a footbrake, you won't see the true stall speed, the car will move first, but with a trans brake you will because a trans brake locks the imput shaft. So take that into account when selecting a converter. Also, if you have a lock up unit, it doesn't matter if the stall speed is above your cruise RPM, the computer will still lock it, and your mileage will only suffer around town.***I'll finish later, I have company :behind:</blockquote>