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Old Sep 23, 2016 | 07:41 AM
  #16  
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Is this the one? Pictures of items for sale can be deceiving...you might or might not get one that looks like that. With that being said, yes, it looks to be correct.

1970 to 1981 Ford 351C 400 Cougar Mustang Torino Truck Harmonic Balancer Damper | eBay

Go ahead and grab it if you can spare the bucks. Have you checked all the bolts/nuts, etc for tightness/correct torque after the transplant?
 
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Old Sep 23, 2016 | 07:50 AM
  #17  
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Yes every thing is tight, will snag up the balancer
 
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Old Sep 23, 2016 | 08:11 AM
  #18  
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Ok, good. Don't think I'm a "parts miser" hehe...I would have offered to trade you straight across for your 400 stick balancer for my 400 auto one, but the auto one's rubber dampener is cracked all the way around. It's good for just a paper weight now until I can send it out for fixing.......

Good luck and I hope it works for you. I know you'll get back to us with the results.

Another thought....the C6 transplant was up to snuff when you installed it, yes?
 
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Old Sep 23, 2016 | 10:52 AM
  #19  
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No worries, they are hard to find. Thanks for all the help and as soon as I get the new one installed, I will give updates.
 
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Old Sep 23, 2016 | 11:45 AM
  #20  
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Possible thread hijack alert:

I have a similar vibration in my 77 F100 2wd. It had a 300 with a manual 4 speed. (T19 I think). I just changed it to a C4 and have been chasing a vibration since.

I installed a new vibration dampener, new trans and motor mounts, balanced the driveshaft, etc, etc.

I installed a new flex plate with no external weights as the 300 is internally balanced.

Could I have installed an incorrect dampener? Could my new torque converter be out of balance?

Any thoughts would be appreciated.
Rich
 
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Old Sep 23, 2016 | 02:47 PM
  #21  
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Rbeck204;

Have you the same problem as in a vibration even with the vehicle in PARK with the engine running?

How is the fluid in the C4...full up?

Did you fill the torque converter with ATF before installation....and all the required vacuum lines are hooked up and correct?

...And the torque converter bolts are tight and good?

I can't help you on the balancer part numbers or the difference between the balancer weights, if any. I haven't played with I6 engines much to know.

I'll try and look some stuff up but can't guarantee finding any thing you haven't.
Maybe Mikeo0o0o0 or Mr. Bill (aka) Number Dummy can be of more help.

Maybe you could peek in the I6 forum....or post your query there?
 
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Old Sep 23, 2016 | 03:52 PM
  #22  
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Yes, the vibration is at idle also. And yes, filled the torque converter, it is tight, vacuum lines are good.
I also changed all the electrical items (plugs, wires, spark control box, distributor, coil) just in case something there was causing a problem. Also changed the EGR valve, just in case. New u-joints as well.

I am almost ready to give up.

Rich
 
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Old Sep 23, 2016 | 04:35 PM
  #23  
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Ok Rich;

From my limited experience with I6s, I've found the stock 1v carb to be problematic....trouble adjusting mixture screws and idle quality and intake vacuum leaks. The distributor seems to be prone to causing troubles, too. Hairline cracks in the cap, loose rotor....

Don't get me wrong, I love the I6 300..a great engine! One of Ford's "better ideas."

And, an engine is an engine.....the same weight differences in rotating assemblies between stick and auto transmissions apply, in my mind.

I'll try and find out something.....interrnally balanced engines still are in need of harmonious turning. I can't guarantee any earth shattering new news for you but I'll give it a whirl.

Maybe someone else with experience with the I6 300 will come along...

Don't give up....think it through and read what you can on it.

Mike
 
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Old Sep 23, 2016 | 07:28 PM
  #24  
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Robbie58;
A dumb question: You did put the block to bell metal separator plate on, yes? It looks like this:




351M/400 block to auto trans separator plate.


Rbeck204 (Rich),

The same dumb question from me to you also....pardon my asking....just trying to get the facts.....
 
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Old Sep 23, 2016 | 07:34 PM
  #25  
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Yeah, I put the block spacer on. Keep the suggestions coming. No such thing as a dumb question.

Thanks,
Rich
 
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Old Sep 23, 2016 | 07:52 PM
  #26  
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Rbeck204 - Rich...

What I have come up with so far is that the I6 has/had 6 different balancers....How many pulleys on your Har Balancer do you have?

This bit of info has come from an old (haha) post by Number Dummy.
 
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Old Sep 23, 2016 | 09:20 PM
  #27  
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The balancer has three grooves. All one piece. No additional bolt on pulleys. New one matched the old one but the old one was for a manual trans if there is a difference.
Rich.
 
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Old Sep 24, 2016 | 09:24 AM
  #28  
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Ok, three pulley grooves. Narrows it down to two different balancers. One is for an I6 HD 300, and one is for an I6 300 LD and HD. No mention of being specifically for manual/auto....yet.

I'm almost thinking there might not be a difference with a zero balanced 300....but that goes against logic. I'll keep looking as I'm sure you will.

Can you see/determine the Ford engineering number on it?
 
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Old Sep 24, 2016 | 10:44 AM
  #29  
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Originally Posted by Rbeck204
1977 F100 300 I-6 2WD with swapped in C4.

The balancer has three grooves. All one piece. No additional bolt on pulleys.

New one matched the old one but the old one was for a manual trans if there is a difference.
1977 300 I-6: TWO different harmonic balancers, one is CA only.

A/T or M/T makes no difference. Non CA balancer marked C8TE-6316-B .. The two inner pulley belts are 3/8" wide and the outer pulley belt is 1/2" wide.

300 C4 uses a different flex plate than the 300 C6.
 
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Old Sep 24, 2016 | 01:02 PM
  #30  
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Thanks for the information, Bill. I'll file it away for future reference.

I know I read somewhere about the different flexplates for the C6 and C4 but it didn't hit me 'till you mentioned it. I presupposed Rbeck204 knew about it whereas I didn't.
 
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