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I need some guidance. 360/904 Balancing #2780329
06/01/20 12:57 PM
06/01/20 12:57 PM
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Wichita, KS
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tmef Offline OP
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I put a 360 together and did cam break in with a built 904 (full manual, reverse pattern). Drove it around for a few days and the novelty of driving it on the street wore off real fast. So I got another 904 in a parts swap (pictured). It is a lock up trans. The converter has three weights welded to it. Two small and a larger one. I know this transmission was hooked to a 360 and installed in a first gen Dakota. My questions are do you think this converter is already weighted for a 360? Am I going to use a factory flex plate or the B & M I bought to use with my other transmission? Or do I grind these weights off and use the B & M flex plate?

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Re: I need some guidance. 360/904 Balancing [Re: tmef] #2780332
06/01/20 01:16 PM
06/01/20 01:16 PM
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Bend,OR USA
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All the external balanced stock Mopar converters I've seen have bigger weights welded onto the front of the converters, not like yours shruggy
I wouldn't experiment with out knowing for sure the converter you choose is compatible with your motor and flex plate first twocents


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: I need some guidance. 360/904 Balancing [Re: Cab_Burge] #2780344
06/01/20 02:06 PM
06/01/20 02:06 PM
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So Near, Yet So Far
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What Cab said.
On my 406-inch 360 I went with internally balanced but used the stock non-lockup converter & plate.
I dislike external balance for a few reasons, converter hassle being one of them.
The big OEM external-balance weight was easily knocked off, the small left on. Had zero vibrations.
What I don't know is if the external-balance weight was in the same place on all applicable converters.
Seems that way, someone here will know.
I would want to know who did that converter & what's up with it.

Re: I need some guidance. 360/904 Balancing [Re: tmef] #2780415
06/01/20 05:03 PM
06/01/20 05:03 PM
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Put it in and drive it, report back. It looks like a 360 non magnum to me.


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Re: I need some guidance. 360/904 Balancing [Re: Guitar Jones] #2780474
06/01/20 06:48 PM
06/01/20 06:48 PM
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If there's a part number somewhere like on one of those stickers you might want to look it up and see what it's for.
The torque converter that was behind one of my 360s had no big weights but was still balanced right for a 360. Every one I've used since I've had a local transmission shop weld the proper weight on if the converter wasn't balanced for a 360.

Re: I need some guidance. 360/904 Balancing [Re: Guitar Jones] #2780511
06/01/20 08:43 PM
06/01/20 08:43 PM
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Wichita, KS
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tmef Offline OP
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Originally Posted by Guitar Jones
Put it in and drive it, report back. It looks like a 360 non magnum to me.


This is what I have decided to do. I mean it's definitely not for a 318. So what else could it be? I will run it with the factory flex plate and see how it goes. If no good I will try grinding the weights off and using the B&M flex plate. This engine is going to end up in my Shelby Dakota so I will still need the B&M flex plate when putting to the A500. Thanks for all the input guys.

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Re: I need some guidance. 360/904 Balancing [Re: tmef] #2780561
06/02/20 06:08 AM
06/02/20 06:08 AM
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elmor353 Offline
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Every 360 convertor I've ever seen had weights on the front. The weights on the side are to give it a neutral balance. That looks like a neutral balance convertor. If you have the B+M offset weighted flexplate, you can run that convertor. I wouldn't run it with the factory flexplate unless you like pulling the engine back out to put the B+M plate back in. Don't grind the weights of the side. You'll just be creating headaches for yourself and you will end up having to get another convertor. Trust me on this and don't ask me how I know.

Re: I need some guidance. 360/904 Balancing [Re: elmor353] #2780578
06/02/20 08:05 AM
06/02/20 08:05 AM
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Wichita, KS
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tmef Offline OP
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[quote=elmor353]Every 360 convertor I've ever seen had weights on the front. The weights on the side are to give it a neutral balance. That looks like a neutral balance convertor. If you have the B+M offset weighted flexplate, you can run that convertor. I wouldn't run it with the factory flexplate unless you like pulling the engine back out to put the B+M plate back in. Don't grind the weights of the side. You'll just be creating headaches for yourself and you will end up having to get another convertor. Trust me on this and don't ask me how I know. [/q

Sounds like the path I should follow. Thank you.




Last edited by tmef; 06/02/20 08:06 AM.
Re: I need some guidance. 360/904 Balancing [Re: tmef] #2780637
06/02/20 11:06 AM
06/02/20 11:06 AM
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north of coder
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those weights around the circumference are DEFINITELY there to make that converter neutral balanced !
ALL external balanced converters matched to external balanced engines have weights welded to the ENGINE side of the converter.
if those weights [in the front/engine side of the converter] are missing, you need to use a weighted flexplate like the B&M pictured.
beer

Re: I need some guidance. 360/904 Balancing [Re: moparx] #2781013
06/03/20 11:02 AM
06/03/20 11:02 AM
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MI, usa
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Those are neutral balance weights. Mopar external balance weights are always on the front surface next to the pads. If this converter came from a Magnum it would have been externally balanced using the flex plate. I believe the Magnum conveter bolt pattern is symmetrical as well. Magnum and LA use different amounts of imballance.
Dou

Last edited by dvw; 06/03/20 11:04 AM.
Re: I need some guidance. 360/904 Balancing [Re: dvw] #2781229
06/03/20 09:43 PM
06/03/20 09:43 PM
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Lincoln Nebraska
RapidRobert Offline
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X3 the weights on the curve side are to balance the hunk of metal to neutral balance to begin with at the factory when they spin it then weights are added to the flat face if it is externally balanced. the only thing that may or (may not) mess things up is if there is a difference between LA & mag 360's torque converters (in the balanceing) EDIT if no issue there use the 10239 plate & your good if the plate mounting holes are offset (regular 360)

Last edited by RapidRobert; 06/03/20 09:45 PM.

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Re: I need some guidance. 360/904 Balancing [Re: RapidRobert] #2781375
06/04/20 12:53 PM
06/04/20 12:53 PM
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tmef Offline OP
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Thanks again all. I am going to drop it in tomorrow with the B&M 10239 flex plate. It is an LA 360, I just have Magnum exhaust manifolds on it.







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