1974 Dodge Dart Magnum Swap

Bobzilla said
Where did you get this engine; from a truck you were able to drive and test, or did you get it already removed? I see you said it's the balancer and flex plate that came on the engine, but I am wondering if they gave you a mismatched flex plate, or balancer. Some of the descriptions are conflicting, making it harder to evaluate. It shakes at highway speeds, but not sitting in park with rpm at a steady 2500, and goes away when engine is turned off while at speed. At what vehicle speed and rpm does it actually show up? Is it worse when you floor it while it's happening? Do you feel it at all in second gear, before transmission shifts to third? Also, an early post said you were using a new converter, but a recent post said it was from your existing trans, so what's the story there? Sorry for all questions in one post.

I got it removed but I tested it on the stand. Flex plate and balancer were bolted to the motor when I got it. I saw the motor running before purchase but no didn't drive it. It used to start shaking around 60 to 75 mph, now shakes at around 45 to 55 mph since lower gears installed. No it doesn't seem to shake when sitting still and yes if I shut it off it quits shaking. If I let out of the gas it shakes less and shakes more when back on the throttle. I couldn't tell you on the gear thing unless I took it out and drove it again. I am pretty sure it something to do with flex plate. I initially had a new torque converter but it was a balanced one so I got my old one out that was a nutral or unbalanced. When I put the flex plate on I had to make a couple holes bigger to get it to bolt up to the old style torque convertor. In doing so I think I may have it in the wrong spot in turn making the thing vibrate.