My car was smooth as silk. Now it has a engine vibration between 1800-2300 rpm. It is 100% NOT drivetrain, wheels, or diff as it goes away the second its in neutral while driving. Free revving you can also feel it at the same rpm range. The only thing I did was swap out a new clutch and TA Performance aluminum flywheel and added headers. Could the TA flywheel be that out of balance brand new? I've never had this happen in any other car just swapping in a brand new flywheel. For a while I thought it was the headers rubbing on the frame but its so specific on the revs.
I did a little bit of reading, can't believe the BBBs are that temperamental with flywheel balancing?! I've never had it make any difference on any other cars I've owned, so kinda surprised. So can I just take the aluminum flywheel and original flywheel to a machine shop to be matched up for balancing?
I can’t say with 100% certainty. BUT I can tell you that I had the same question concerning a harmonic balancer switch and the answer was......Yes. Bring both to a machine shop and have them balanced the same and you will be good. Front of the engine vs back of the engine, all the same when it comes to balancing. Maybe those who know more will chime in? Cliff
Your machine shop can balance the pressure plate as well. You should always match balance a new flyheel or flexplate to the old one
Jason, What are your options if you dont have the old flywheel ? If you supply the machine shop with flywheel pressure plate and balancer is that enough or would the crankshaft be needed as well ?
That's a real issue. In my situation when I did the 4 speed conversion on the beater, the machine shop told me the new flywheel I was putting on checked out and no match balancing was required. And he was right. Engine is smooth as silk. So if I was in your shoes, I would put it together and cross your fingers and toes that its in spec
To match balance 2 flywheels, what they do is bolt the 2 together, 180 degrees out of phase. They will obtain a neutral balance by drilling the new flywheel for the proper amount of weight removed.
I had the same issue with my flywheel. Assembly was balanced with the original flex plate. It ran very smooth. When I switched to manual trans I was way out of balance. I took the flex plate and flywheel to a machinist and for a small fee it's smooth as silk again
When I changed from TH400 to T56 Magnum I brought the Flexplate and the new Flywheel to the machine shop. They said they can't balacing the flywheel without a crankshaft. They took the crankshaft with the old Flexplate added the bobweights to get zero and then replaced the Flexplate with the Flywheel and balanced about 20g... I don't know if that's true, but they've been doing it for 50 years. Unfortunately it seems you need your old flexplate...
