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 - New Hitches For Your Old Tractor - by Chris Pratt. For this article, we are going to make the irrational and unlikely assumption that you purchased an older tractor that is in tip top shape and needs no immediate repairs other than an oil change and a good bath. To the newcomer planning to restore the machine, this means you have everything you need for the moment (something to sit in the shop and just look at for awhile while you read the books). To the newcomer that wants to get out and use the machine for field work, you may have already hit a major roadblock. That is the dreaded "proprietary hitch". With the exception of the
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