1974 Dodge Challenger vibration in engine

SMLBLK

MEMBER
1974 DODGE CHALLENGER

Engine Mechanical problem
1974 Dodge Challenger V8 Two Wheel Drive Automatic

its a 360 hp rebuilt.030+ w/stock rods stock crank hp cam engine was decked.005 and slght modified. My problem is I get a vibration at 1100 rpm goes away at 1700 rpm and returns at 2000 rpm above 2150--2200 goes away.I did have the engine balanced and I have a torque converter that does not have any weights. Neutral balance 2500 stall. Also in the performance world b+m racing makes a flexplate with a notch cut out of it. They use the term as less is equal. The car in park engine running I feel the vibration in the steering wheel and transfers to the console. Goes away after 2500-3000 rpm. Could this be a balancing problem
thanks I will hope to get a responce soon

4 Replies

DOCFIXIT

MECHANIC
18,828 POSTS

Did you install new harmonic balancer?

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Wednesday, September 30th, 2009 AT 2:14 PM

SMLBLK

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Thank you for your responce.I own the dodge challenger that I questioned you about. YES I did change the harmonic ballancer with a stock new replacement and the new one weighed the same it was the same size. And the ballancer looked identical to the old one. Could a non-weighted tourque converter and a flexplate with a notch cut out of it cause a vibration all the time or not.I only get this at a certain rpm.