The 350 and 400 flex plates are the same. The harmonic dampers are different. I'm putting a 383 (400 crank in 350 block) together to replace a 350 in my 98 Silverado. Because I'm building a core engine and don't have the engine out of the truck yet, I had to buy a new flex plate for the machine shop to do the custom balance on the rotating assy. It was quite a bit cheaper to go with a 400 damper than have a huge amount of weight added to the crank. Weighting the crank might be better for high rpm's, but this will be a trailer towing/daily driving engine. Like Gary says, we need to know if the vibration present only when driving, or can it be recreated in neutral with engine speed?
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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