340 Engine Shake

plumkrazee70 said
It's a RAM clutch and steel flywheel. They were ordered as neutral balance. I didn't notice any weights on them.

I understand the balance concerns, but lots of folks put 4 spds in after the fact and don't rebalance their cranks or am I missing something?

I'll add removing the belts to my list. I found a guy in town who is a mopar guy and has his own shop. I am going to trailer it down there he can go through all things at once. I will keep everybody updated

I appreciate everyone taking the time to chime in here. It definitely gives me a place to start.

Regarding the balance concerns: it depends. Lots of builders will balance the whole rotating assembly, and sometimes make adjustments to parts other than the crank - which is bad if you swap those parts (flex plate, balancer, etc). A good builder makes the changes to the crank - it's hard to know which way the shop did it unless you really look hard at the original flex plate or have an invoice or have it well documented some place.

More than likely your balance is good. Once I got the proper flywheel on mine, but I still had the wrong balancer, it was very noticeable. The mirrors shook at 1100rpm, the clutch pedal vibrated against the stop, it was a mess. I think you'd notice. The difference from a 360 to a magnum balancer was my issue, and that's not a huge amount of out-of-balance. I'd be shocked if a flywheel install was that far out if it was sold as neutral balance, but it does happen.

I'm still convinced it's a misfire situation due to either fuel or spark, but it's hard to say for absolute certain without being there in-person, so I could be very wrong! lol.