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Old 02-23-2006, 10:45 AM
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Trans rebuild and engine break-in?

I am putting my Mopar back together and need to get some advice. I rebuilt my engine and transmission with a new J&W 10" convertor. My question is during the cam shaft break-in what precautions should I take with the trans being new with a new convertor? The convertor instructions say to add 1/4 qt. to the convertor when installing and add 4 qt to the trans, start the car without reving and add another 5 qt or more until full. Well the car has to be reved up to about 2200 rpm to break the cam in! What is the correct way to do this? All my experience has been with manual trans. so please excuse my ignorance.

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Old 02-23-2006, 12:54 PM
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Can you un-bolt the converter and slide it back away from the flex plate? That would be the best way to do it. Break in the engine without having to worry about the trans just yet. Once the engine is done, re-mount the converter and fill and idle and add 'till full.

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Old 02-23-2006, 01:44 PM
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On BB Mopars the starter ring is on the convertor, so the only way you can start the engne is have the convertor installed.
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Old 02-23-2006, 02:01 PM
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Hmm, I thought about that after I posted. Well, about all you can do is put a quart in the converter, maybe 4 quarts in the trans and fire it up. Have someone standing by to pour in another 3 or 4 right after you fire it up.
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Old 02-24-2006, 04:34 AM
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Thanks Mark.
Another question. I bought a J&W 10" converter and I am having a lot of trouble getting it on. I get it started and it goes about an 1" and then stops solid, I wiggle it a little and rotate it, and push, wiggle some more, rotate some more, but it won't go no further. I tried to put my stock converter on and it went on with no problem. I read the J&W instructions and they said that their tolerances are much greater than OEM equipment, so you will have to work a littler harder than normal to get their converter on! They also said that people return them all of the time saying that the hole is too small for the input shaft, but J&W says that is not the case they just fit a lot more tighter. Any tips for getting these things on?
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Old 02-24-2006, 06:10 AM
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usually what happens with the 727 converters is that the input splines in the converter will fall off center when trying to install... usually when it does this, i get it in as far as ur getting it, then with 1 hand, hold the pilot, and with the other, spin the converter by the weights or mounting pads while trying to push the converter in at the same time...
as far as fillup is concerned, u can still fill the trans while breaking in the cam, just have a second set of hands to help out. 1 to fill the trans, while the other worries about the engine. best of luck
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Old 02-24-2006, 07:26 AM
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Thanks, I will try this when I get home.
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Old 02-24-2006, 06:02 PM
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Actually the inner pump gear may need to be lined up to install the converter.
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