I have a engine vibration i am pretty sure, in nuetral i rev the motor and in between 1500-3000 i get a vibration above 3000 it seems to clear out, also does this while driving in gear. while under load the vibration is more violent, i replace the clutch recently and just started doing it after the install. has a new trans mount, i am wondering if this could be a flywheel problem? it did not vibrate at all before i did the clutch, or if it could be the balancer, the car is a 88 camaro with the 305TBI. everything seems to be working fine in the trans, but i get a pretty annoying and bad vibration, i have no idea why it would be the flywheel or clutch related. also there is 140,000 on the car but almost all the suspension is new, only thing i have not tried is plugs and wires, or motor mounts?? not sure about this and it is really bugging me, if anyone can help me out it would be greatly appreciated.

 

Did you replace the flywheel or modify it in any way?

 

nope, it looked fine so i threw the clutch in and didnt even think twice about it.

 

anyone have any ideas? i dunno where to start. I had it on the highway last night and the vibration comes on at about 60mph, so im starting to thing it is driveline related.

 

is it only at 60 MPH or at certain RPMs? if its MPH related then its outside the trans, maybe drive shaft related. check the Ujoints, if there is ANY hangs, "thumps" or anything that keeps it from moving even and free then its most likely your issue. a shaft that has any of this will surely vibrate.

 

it does it at mph, and at rpm. In all gears 1st being the worst. upon acceleration i get a vibration from 1500-3000. then on the highway i get one from 60mph and up. i have tried 2 different driveshafts both with new u joints. the one in it now is a steel one from my 4th gen. Im stumped on what it could be. its definitly not a tire or suspension probelm that has all checked out fine.

 

what about your motor mounts and trans tail mount? also check your rear, if the pinion bearings are moving a lil it will throw it out of its rotation and cause this. get the rear chacked up, yank the shaft, yank the wheels (this eliminates the extra weight shift when the wheels are on from the drive train slack), grab hold of the yoke and yank on it with all of your weight. if you feel any give then its a good possibility thats your issue.
a lil movement adds up when the car adds its strength as what we feel is a small % vs what the weight and load of the car can do.
on my S-10 i reeeeeeeeely had to work to feel the slack but when i drove it you could feel it on decel and accell.
after i got it fixed i could tell a diff.

 

you may need to replace the bushing in the flywheel.