I based my reply on your description of, "the tranny would slip a little bit from 1st to 2nd gear".
ALL automatic transmissions slip a tiny amount when one clutch pack releases and the next one engages. That is what makes it feel comfortable, but that is when the normal wear takes place. If you experienced a little extra slippage only during that shift from first to second gear, the same amount of wear took place that might occur in half a day's driving, in other words, not much.
The way people do serious damage is when the slippage occurs NOT during the shift but when it is locked in any one gear. THAT slippage is comparable to holding the clutch pedal down part way with a manual transmission. As long as that type of slippage occurs, the clutch plates are wearing away rapidly and are overheating. Overheating can also melt the rubber seals that hold the pressurized fluid in and help hold those clutch plates applied. Any extra slippage that you feel during an up-shift is not anywhere near enough to cause overheating or any other damage. From what you described, once the new sensor is installed, you won't even know there was a problem.
Wednesday, April 20th, 2011 AT 9:44 PM