It's definitely not a drivetrain vibration, as much as I wish it were that simple. It's something from the transmission forward. I do need to replace the motor mounts but they aren't in terrible condition. It could potentially be a transmission problem but I truly doubt it. It happens with clutch in or out at high RPM.unhook DS & run 2 C if its uJoints or shaft (even angle)?
motor mounts? transmish?
Talk w/OP (if old noise).
As far as I know, this was a $300 engine that came out of another 1987 GT so that the guy could put a stroker into his car. It was taken out running with nothing that would lead me to believe it wouldn't be a 50 oz. imbalance. It was a roller engine that had original bottom end and all that mess.Just FYI - stroker engines take 28oz or 0. My 331 is 28oz. I've also seen 331 engines with ported e7 heads. This is one of those times when engine history could be really important. I hope you've solved it with the new flywheel though.
Yeah, I should've mentioned that early on, apologies for that... I did much of the stuff on the surging idle checklist, but I'm fighting a couple of them right now. I have a code 67, something up with my neutral ground switch. I replaced the switch so now I have to try and hunt down whatever funky wiring issue it could be, I've got another thread going on that one. I think I may have a vacuum leak but it's nothing on the top end of the engine, if it's anywhere it's at the intake gasket because I've even done a smoke test to no avail.I don't remember you saying anything about surging or running bad when this began, I was not convinced it was a drive line issue from the description, it still may be part of the problem, so let's get the engine straight first. I would go through the surging idle checklist.
Replace the motor mounts, you did say they were suspect.
Everything starts with the engine, literally, if it ain't right, nothing is right.
DISCLAIMER: this is an opinion based on what I read, and my reading is suspect at best, not based on any real mechanical experience.
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