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johnjzjz · 12-29-2007, 09:59 PM

an over drive converter is not designed to go to lock when the TV cable connected to carb or TB is pulled all the way out, in a simple explain the excessive oil pressure stops the Governor from allowing it to happen -- its a little more involved than that but you get the idea -- also the 400 trans was the choice for GM with big block motors from the 60s making 375 to 600 HP in some cases, the 700 trans was GMs choice for fuel economy and low performance engines - just so you under stand the lock up in the converter uses the stater support on the front pump to take the load on its splines and after a while they the splines wear causing the vibration and or the odd bump you feel when it locks up, the 400 on the other hand is a bull dog it can take a wild beating and still give good service for a long time -- heaver and takes more power to use -- jz

12-29-2007, 09:59 PM	#15
johnjzjz . Join Date: Feb 2006 Posts: 1,385 iTrader: (0)	an over drive converter is not designed to go to lock when the TV cable connected to carb or TB is pulled all the way out, in a simple explain the excessive oil pressure stops the Governor from allowing it to happen -- its a little more involved than that but you get the idea -- also the 400 trans was the choice for GM with big block motors from the 60s making 375 to 600 HP in some cases, the 700 trans was GMs choice for fuel economy and low performance engines - just so you under stand the lock up in the converter uses the stater support on the front pump to take the load on its splines and after a while they the splines wear causing the vibration and or the odd bump you feel when it locks up, the 400 on the other hand is a bull dog it can take a wild beating and still give good service for a long time -- heaver and takes more power to use -- jz Last edited by johnjzjz; 12-29-2007 at 10:00 PM.