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Unread 08-25-2014, 11:10 AM   #16
skizriz
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Wonder if its possible it came out stuck to the old converter, or if it didnt have one (the engine looks to be a swap) and it just didnt vibrate with the old TC and FP.

Guess ill have to slide it back and take a peek.

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78 CJ7 258 TH400/Dana18 SOA/stock YJ springs 35" General Grabbers.
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Unread 08-25-2014, 11:19 AM   #17
jblue1555
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Someone could have had a converter built with a 727 snout to eliminate the need for the ring.
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Unread 08-25-2014, 05:24 PM   #18
skizriz
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Here's what I got going on. I have no idea how much wobble is acceptable, but this seems excessive to me. I ran the rpms up to the point of the most vibration.


Here is a shot of it unbolted from the flex plate. I tried to show the movement of me pushing up on it. It is a very small amount, but pushing up on it makes a difference in getting the first bolt started into the TC.


I hate to think it's a crooked TC or flex plate.
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Unread 08-25-2014, 06:19 PM   #19
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A couple more. Doesn't look as bad from directly below.

In this one the 3 TC bolts are only finger tight.


Bolts are tightened back down in this one.

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Unread 08-25-2014, 06:33 PM   #20
jblue1555
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Should have asked this earlier, you are sure the flexplate is the right one for the engine.
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Unread 08-25-2014, 06:50 PM   #21
skizriz
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Quote:
Originally Posted by jblue1555 View Post
Should have asked this earlier, you are sure the flexplate is the right one for the engine.
According to the MFG, Pioneer, it is. Pioneer FRA-119 W/O weight. Just checked my records, that's the number Summit sent me. Summit has FRA-108 listed as for the th400,I called Pioneer to make sure on who's number was correct. 108 is for the later years.
Looked identical to the old one.
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Unread 08-25-2014, 07:32 PM   #22
jblue1555
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Same engine, correct flexplate, vibration, pull it, check for sleeve in crank,double check trans.
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Unread 08-26-2014, 02:14 AM   #23
grasmo
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I don't see anything unusual there. you didn't by chance do any recent work on the front of the engine did you? if not, and you're sure about the trans. rebuild, I would have to think that converter has a problem. a tc is a fluid coupling and by nature fluid couplings combat vibrations unless it has an internal issue.
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Unread 08-26-2014, 12:24 PM   #24
schardein
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Here is a story:
I took the TH400 out of my 78 K20 and put it in my K5. Years later, I pulled it and took it for rebuild. The rebuilder took one look at it and said, "you'll need a new converter". Why, I ask. "Because your centering washer is gone. Chevy welds a washer to the front of the TH400 torque converter and that is what centers it in the crank. A TH350 simply has a snout that aligns in the crank bore. Look in the back of your crank when you get home". Sure enough, the washer was stuck in there.

I never noticed a vibration before that, but with my driveshaft vibrations, that doesn't mean it wasn't there.

Also I am no expert on AMC TH400... but my guess would be they are the same way.
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Unread 08-26-2014, 04:27 PM   #25
skizriz
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I have plans to go wheeling this weekend, so i wont be tearing it down until after then. Im going to see about exchanging the converter while i have it out also. Hopefully it isnt something inside the trans.

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