Thread: For Don Shilady

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Rodger, although I have received a LOT of useful information on this Forum it is a weakness that we have to resort to descriptions instead of hands-on experience. I will try the stall experiment first chance I get but I am content that my 700R4 behaves almost exactly the way my 1998 Sunfire 4-speed and my 2008 Impala 4-speed behave. On the low gear only test I backed off in low gear at 3700 rpm because the test road is short and I was approaching a curve. Depending on how hard I press the pedal, the low to second shift may be at 2000 rpm, 2500 rpm or 3100 rpn where again I backed off on the 3100 rpm shift because I ran out of room before an impending curve. Ironically just around the bend there was a county patrol car so I slowed down just in time! I don't really understand the torque multiplication of the torque converter but it seems to work in the same way on all three of my GM driveline cars.

Don Shillady
Retired Scientist/teen rodder

Originally Posted by Don Shillady

On the low gear only test I backed off in low gear at 3700 rpm because the test road is short and I was approaching a curve. Depending on how hard I press the pedal, the low to second shift may be at 2000 rpm, 2500 rpm or 3100 rpn where again I backed off on the 3100 rpm shift because I ran out of room before an impending curve.

That's just how it's supposed to work. The torque converter is nothing but a fluid coupled pump, varying the amount of pressure into the transmission, with pressure switches, check valves, etc, etc in the tranny using that pressure to control gear selection. You're converting the torque of the engine to pump pressure in a smooth coupling that allows slip. Google "how does a torque converter work" and you can find a myriad of explanations.

Did you give the trooper a little wave as you met him?