727 Transmission Efficiency...

d55dave said

This is because, at 3000 rpm, you are above the "stall" speed of the converter. Stock stall speeds are 2400 to 2600 rpm. Below the stall speed the converter will allow the engine to flash up to the stall rpm. Above it the input and output rpm are linear with a certain percentage of slippage.

Performance converters (some people wrongly call them stall converters, ALL converters have a stall speed) have a higher stall speed to allow the engine to flash up into the powerband rpm.

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That is a really good explanation. I have some vague images of a torque converter in my head from seeing such images on the internet. But I've never taken one apart. To me, the whole converter and automatic transmission is magic and wizardry inside a metal housing.

I'm getting my mind wrapped up into replacing the tachometer. Right now its a vintage Suntach? unit. Most people like these, I guess for the nostalgia. But I'm not really down with it. And it's located above my left knee and I don't like that either. I'm wanting to upgrade the tach and put it and the AFR gauge up on the dash.