440 auto to 4 speed.............

i got a good 440 out of a 75 new yorker and put it in our 71 charger and bought most all the parts to convert to a 4 speed
it was pointed out that i could not put a 4 speed behind a 440 that had a cast crank because of balancing
i bought a 11 inch flywheel but was told cant use it behind the cast crank 440
am i screwed here now??

No, they make a balanced flywheel for the cast crank engines. There's a diagram floating around on here showing where to drill holes in a forged crank flywheel to balance it for a cast crank. Also I think all the big 4sp places have them as well, passon, brewer, even keisler I think.

if you go looking for a stock,440 cast crank 'wheel, here is what the factory did to balance them:


this one came off a 1977 400 in a truck. 400 and 440 share the same inbalance on the cast crank.

Here's the diagram.

What is this one from? Cast Crank? What engine? Ignore what some junkyard dog wrote on it.

70-2 10.5" 440 with heavy rods (6-pack)

I dont think you have a pilot pushing in a cast crank or a deep enough hole to install one. Check and make sure!!

Quote:

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I dont think you have a pilot pushing in a cast crank or a deep enough hole to install one. Check and make sure!!

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They make one specifically for use in an auto trans crank. It's shaped a little different and sits in the hole for the torq converter snout. Only mod you have to do is trimming the tip of the input shaft a little shorter.