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taco
    
Why does my 74 f100 with a 391 vibrate @ idle speed?
Im restoring my late dads 74 f100.It originaly had a 360 in it that was just worn out @ the time,It was replaced with a crate 360 and didnt get driven much.After 6 years and 3 thousand miles it started smoking.This was replaced with a 391 from a f600.This motor runs well but vibrates @ idle speed.The 391 was a straight shift but mine is an automatic.Any ideas will be a big help~!Thanks.
posted: January 1, 2011
 
    
 
  Answers (6)
 
retiredpartsman
    
IF YOU USED THR 360 FLYWHEEL ON THE 391 THAT IS YOUR PROBLEM.UNFORTUNLATLY FORD DID NOT MAKE AN AUTOMATIC FLYWHEEL FOR THE 391 ENGINE.ACCORDING TO THE HOLLAND INTERCHANGE MANUAL 42ND EDITION. ///// BALANCE IS NOT CORRECT AND WILL CAUSE MAIN BEARING PROBLENS OR COULD BREAK CRANK THROUGH HARMINIC VIBRATION
posted:  January 1, 2011
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chevygilligboy
    
If your fuel mixture is too lean, this could cause this and overheating
posted:  January 2, 2011
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carmaniac1000
    
It is either misfiring or wired improperly.
posted:  March 17, 2011
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carmaniac1000
    
Stick shift models were balanced differently. You can take the motor and have it balanced properly. you may be having problems with your flex plate
posted:  March 17, 2011
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jerrysford
    
The 360 and 391 are internally balanced at the factory. The 391 uses a much large pilot bushing than the 360 or passenger fe's. Since you are using an auto the pilot bushing is not used but the end of the crankshaft is not compatible with the hub on the convertor. A machine shop should be able to make a bushing to correct this. Check the flexplate for cracks since you've been running it.
posted:  May 17, 2013
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raulerichardson
    
TRY CHECKING FOR VACUUM LEAKS.
posted:  June 28, 2013
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