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Unread 12-31-2011, 01:45 PM   #1
Donhrrs123
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1983 CJ7 
 
Join Date: Jul 2011
Location: Grafton, Ohio
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Engine Balancing

Hello, My recently purchased 1983 CJ7 has an inline 258 6 cylinder. I am a first time jeep owner and loving it. There is a vibration in the drivetrain somewhere and I suspect it is the motor. I will vibrate when in park or in neutral sitting still. Are these motors externally balanced?

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Unread 12-31-2011, 01:52 PM   #2
VACJ7
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The 258 is internally balanced.
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Unread 12-31-2011, 01:59 PM   #3
nshefbuch
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Check motor mounts and check tranny mounts especially the torque arm support off the tranny. If you have poly bushings instead of rubber it will vibrate more
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Unread 12-31-2011, 02:05 PM   #4
Donhrrs123
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What if the previous owner used a flywheel/flexplate from a 304? I has a torqueflight transmission. The previous owner said it was a 727, but I think it is most likely a 999.
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Unread 12-31-2011, 02:13 PM   #5
VACJ7
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I believe the AMC v8's are all externally balanced, so if the flexplate is from a 304 it would not be neutral balanced. But I could be wrong. I have a TF999 bolted to my 258. Pan shape will tell you if it is a 727 or 999.
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Unread 12-31-2011, 02:23 PM   #6
Donhrrs123
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Will do thanks.
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Unread 12-31-2011, 04:38 PM   #7
Donhrrs123
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Thanks, I suspected that may be the problem, nice motor on your profile pic!
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