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vibration in drivetrain

Since the last view weeks my car has a new symptom. At 2300 rpm I am having heavy vibrations in my drivetrain. If i change the engine speed +/- 200 rmp everything is fine again.
This is independent from the vehicle speed or gear. It`s more or less the same in standstill and N or P position.

My transmission is a C6 with stall speed 2000 rpm. I have checked all auxiliary systems (ventilation, servo, alternator) and the exhaust system (to be sure that exhaust does not hammer to carbody).

Could this be a problem of my C6 transmission? Does anyone have any ideas ? Huh

Thanks for help.

best regards Christian

My Mustang is a "hybrid vehicle" it burns fuel and rubber Big Grin
If it is the same in P or N could not see how it could be in the tranny. My first guess was the drive shaft out of balance or U joints but if it does it sitting still thats not possible either. Just a guess but maybe the harmonic balancer is badHuh Some more knowledgeable folks will be along shortle I'm sure.
Possibilities; balancer, flexplate, torque converter, pulleys, water pump, front drive accessories... have you added or changed any rotating components lately? Maybe remove front drive belts to see if the vibration changes. A cracked flexplate can shake like crazy. Is there a "clunk" when putting the trans in gear?

Jeff T.

Low buck, touring style, '73 Convertible "rolling restoration", 351c, 2v heads with a shave and a haircut, Performer intake, Holley 650(ish), roller rockers, screw in studs, guideplates, stainless valves, Duraspark / Motorsports MSD, T-5 conversion. 1-1/8" front, 3/4" rear swaybars KYB shocks and some home brewed subframe connectors. Future plans; JGC steering box, Cobra brakes and... paint, interior, etc.

When I die I want to die like grandpa, peacefully in my sleep... not screaming, like his passenger.

[Image: 1_12_09_14_10_15_11.png]
Could be balancer, but if it's not been excessively abused, it shouldn't be the problem. You could lubricate the U-joints and see if it helps at all... sometimes the driveline angles aren't perfect after all these years and many people neglect to lube the U-joints. Makes a big difference... I like the Mobil 1 Synthetic grease stuff.

1971 Mustang fastback: 10.3:1 C90E 408W hydroller - CDAN4 EEC-V w/EDIS8, girdled, lowered and caged
I had the same problem I checked my push rods and they were bent. Had a problem with oil keeping lifters pumped up. Finally ended up putting a mechanical cam in it that was a 351c
Could also be the torque converter to flexplate bolts, loose or missing.

“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
an easy look would be a tranny and engine mounts!!!! i had a nasty looking tranny mount last year and it had a ford stamp on it. Tongue, probably my original one and it was older than me.
Concur with motor/tranny mount.

If motor mount goes, fan will get awfully close/clip shroud. Hate when that happens.

[Image: 11jmcuc.png]
351C Bold Manners, Brash Attitude
Favorite Teams: Michigan Wolverines and Whoever Is Playing Ohio State.

When I drive past a herd of cows, the cows MOO at me
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