hdavew

just replaced a 3.8 v6 from a 99 into my 99, the replacement motor was an auto, and used, mine is a 5 sp. used the flywheel from mine, and the vibration damper that was on the replacement motor stayed, the vibration is very bad at all rpm ranges sitting still, or driving, is it possibile one is internal, and the other external balance motor? if so how can I tell, and what do I use to correct it, tomorrow we are putting the crankshaft damper from the original motor on, that will make the flywheel, and damper, both on the new motor, from my old one. like to get this one on the road. give me your ideas, thank you

Matt's 95 Stang

Did you rebalance the flywheel?

Matthew

hdavew

the flywheel is off the original motor, must be balanced, no vibration from when it was being run, and it can only be installed one way, thank you

petrock

Double check all the motor & tranny mounts. One may be loose, broken or missing. If all that checks out, then double check the spark plug wires to make sure they are connected to the correct port of the coil pack & the corresponding spark plug. Good luck...