Balance Issue / Vibration

340-4spd said
OK, Here's the harmonic balancer:

http://stuff.is-a-geek.net/PhotoAlbum/Cars/Pics/VD1.jpg
http://stuff.is-a-geek.net/PhotoAlbum/Cars/Pics/VD2.jpg

The 2nd one is a little blurry, but near the top you can see the little round dimple I mentioned. The casting number is literally impossible to see due to the headers, but it ends in ..........27 71. Supposedly the cast cranks started in mid '72 with engine number 39118000, but not seeing the first part of the number doesn't really tell me anything, or does it? I'm still saying forged crank. At least it looks like it to me (except for the blue paint!), but what do I know?

What say you, Mopar gurus?

I'm probably just going to get another torque converter - but not until I know which one I need....
Click to expand...
The "dimple" was made to zero balance the damper. The cast crank started in April of '72 but the block could have been cast months before that date. Take a look at your 4 speed flywheel. It should have some BIG holes drilled in it if it's for a cast crank. Otherwise, it will have at the most, small ones like the harmonic balancer.