c4 Tranny exchange

amartin725 · 07-12-2001, 12:34 AM

Try www.windsor-fox.com

Keep in mind the the AOD gives you the overdrive, but it's not a real perfromance transmission. It's much more efficient transmission because of it's because of the lockup strategy.

There are two input shafts in an AOD tranny. One is hooked to the turbine, the other is direct drive. In third gear the torque converter provides 67% of its power thru the direct drive shaft. In forth gear, it is 100% direct to the overdrive gearset so there are no pumping losses thru the converter.

It's a great tranny for mileage, but that direct drive strategy makes it tough to configure as a performance transmission. When you shift gears in a manual tranny, you slip the clutch slightly to get a smooth shift. The AOD does the same. If you set the 4th gear band to shift harder, you get this terrible clunk, like you would get if you just dumped the clutch on a shift because you are in direct overdrive. So you have to walk a fine line between shifts that are hard and harsh and harsh or the soft, smooth, slippery way they are set up for at the factory.

They don't call them slushboxes for nothing!

- Some of the above text was borrowed from Jack Collins

Al

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[This message has been edited by amartin725 (edited 07-12-2001).]

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07-12-2001, 12:34 AM	#7
amartin725 Registered Member Join Date: Mar 2001 Posts: 46	Try www.windsor-fox.com Keep in mind the the AOD gives you the overdrive, but it's not a real perfromance transmission. It's much more efficient transmission because of it's because of the lockup strategy. There are two input shafts in an AOD tranny. One is hooked to the turbine, the other is direct drive. In third gear the torque converter provides 67% of its power thru the direct drive shaft. In forth gear, it is 100% direct to the overdrive gearset so there are no pumping losses thru the converter. It's a great tranny for mileage, but that direct drive strategy makes it tough to configure as a performance transmission. When you shift gears in a manual tranny, you slip the clutch slightly to get a smooth shift. The AOD does the same. If you set the 4th gear band to shift harder, you get this terrible clunk, like you would get if you just dumped the clutch on a shift because you are in direct overdrive. So you have to walk a fine line between shifts that are hard and harsh and harsh or the soft, smooth, slippery way they are set up for at the factory. They don't call them slushboxes for nothing! - Some of the above text was borrowed from Jack Collins Al ------------------ [This message has been edited by amartin725 (edited 07-12-2001).]