'63 401 crank casting numbers

I found a '63 401 to use in my '64 Riviera but now I'm wondering if it will fit the 64 trans. The casting number page on buicks.net doesn't open for me anymore-did I do soething wrong?

No, the hole in the rear of the crank to support the torque converter is much too large on a DynaFlow Trans. as opposed to a TH400. But, adapters are made to do exactly what you need. You grind the large flange off the rear of the crank & install the adapter. Then all you need is a '64-'66 starter, or you could make a shim & shim out the '63 starter about a 1/4"

Tom T.

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Originally Posted by telriv

No, the hole in the rear of the crank to support the torque converter is much too large on a DynaFlow Trans. as opposed to a TH400. But, adapters are made to do exactly what you need. You grind the large flange off the rear of the crank & install the adapter. Then all you need is a '64-'66 starter, or you could make a shim & shim out the '63 starter about a 1/4"

Tom T.

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Thanks-what if I could find a '64 crank? Would it fit the block without any changes? Who has the adaptors for the 63 crank?

Swap it over, but the adapter is the easier way to go. You will also need a flexplate for a '64-'66. I have & can get ANY of the various adapters needed.

Found a 798 crank in the core yard.