904 Slant 6 Transmission

There's 2 ways to tell if it is a lockup. You can look up the P number stamped on the side of the pan rail, drivers side of the pan rail, right below the shift mechanism. You can also pull the converter out of it and see if the input shaft has a tip that is much smaller than the rest of the shaft. The small tip will be about 1/2 to 3/4 length.

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