2.8 vibration/flywheel question!!!!

I have an 86 blazer S10, 4X4, standard. This past weekend I replaced the motor with a 2.8 from another 86 blazer, 4x4 S10 AUTOMATIC. I swapped the fly wheel from the old motor to the new. Now I have a very bad vibration from the motor. I changed the harmonic balancer but it made no difference. 1 guy tells me that I have to have an externally balanced flywheel from an 87-89 2.8. I have tried everything else but i really dont want to drop this transfer case and tranny again if I dont have to. (miserable job on the S10). Does this sound true to anyone? I dont understand why the blocks would be different. Im using the same flywheel from the original motor and they are both the same year. Everyone i talk to says something different!!!! Is there anyone who ACTUALLY knows the answer to which flywheel i need?

This is really driving me nuts!!!
Thanks

Rich

you have to change the flywheel had the same problem

fjeff01,

fjeff01,
Thanks for the reply, can you please be more specific as to what year flywheel i need to install. Right now it is an 86 motor (originally on an automatic), with the original 86 standard shift flywheel.


Thanks
rich