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904/727 behind a 5.7 #2496494
05/15/18 03:27 PM
05/15/18 03:27 PM
Joined: Mar 2005
Posts: 1,545
Michigan
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Kiddart Offline OP
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Kiddart  Offline OP
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Michigan
I know its not a direct bolt up but what is needed to go with a 727 and a 904 to a 5.7.


Thank you
Kiddart
Re: 904/727 behind a 5.7 [Re: Kiddart] #2496542
05/15/18 05:12 PM
05/15/18 05:12 PM
Joined: Jan 2003
Posts: 2,032
MD
RTSE4ME Offline
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MD

Re: 904/727 behind a 5.7 [Re: Kiddart] #2496655
05/15/18 09:44 PM
05/15/18 09:44 PM
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Posts: 1,545
Michigan
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Kiddart Offline OP
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Kiddart  Offline OP
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Michigan
and that was it? Cool no spacers for the convertor? last question for tonight. is there a list of required items to have on hand or that are needed. I have seen one but cant seem to find it as always


Thank you
Kiddart
Re: 904/727 behind a 5.7 [Re: Kiddart] #2496801
05/16/18 11:41 AM
05/16/18 11:41 AM
Joined: Sep 2011
Posts: 2,042
colorado
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savoy64 Offline
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colorado
you have to order a torque converter-----tell them what you have and they will build it to avoid needing the sheet metal spacer....

Re: 904/727 behind a 5.7 [Re: Kiddart] #2496960
05/16/18 09:14 PM
05/16/18 09:14 PM
Joined: May 2005
Posts: 784
Florida
cbusters Offline
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cbusters  Offline
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Posts: 784
Florida
I found out after bolting it all together that the ATI Flexplate is made for Hemi Torque Convertor bolts which is a size larger than the stock 727 convertor you will likely order. The pads will have to be specified as such and also source the 4 bolts at the same time.

Re: 904/727 behind a 5.7 [Re: Kiddart] #2497301
05/17/18 06:28 PM
05/17/18 06:28 PM
Joined: Jan 2003
Posts: 25,618
Rio Linda, CA
John_Kunkel Offline
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Posts: 25,618
Rio Linda, CA
It seems that a lot of folks were bolting up the trans without the spacer until somebody discovered that the 5.7 crank flange extended further from the block than the LA/Magnum.


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Re: 904/727 behind a 5.7 [Re: Kiddart] #2497326
05/17/18 07:52 PM
05/17/18 07:52 PM
Joined: Jan 2005
Posts: 12,406
Kalispell Mt.
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HotRodDave Offline
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Posts: 12,406
Kalispell Mt.
I put a straight edge across a crank flange on both a 5.9 mag and a 5.7 hemi and the 5.7 crank mounting surface does not go out as far on the 5.7 so a spacer would make things worse not better all else being the same.

The hemi does use an 8 bolt plate instead of a 6 bolt SB pattern and the 5.7 has the same 8 bolt pattern as a 4.7. Seems like you could use the 4.7 or 5.7 flex plate and just take off the starter ring gear on the converter. Edit At least on a 727 as the ring gear is the same diameter.

Last edited by HotRodDave; 05/17/18 07:56 PM.

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Re: 904/727 behind a 5.7 [Re: Kiddart] #2497403
05/18/18 12:19 AM
05/18/18 12:19 AM
Joined: Apr 2005
Posts: 935
Deland, Florida
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biff426 Offline
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biff426  Offline
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Joined: Apr 2005
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Deland, Florida
I used the ATI flexplate and a converter I had behind a bigblock and it bolted right up no spacer and no issues been this way 3 years now no issues.

Re: 904/727 behind a 5.7 [Re: Kiddart] #2497435
05/18/18 02:32 AM
05/18/18 02:32 AM
Joined: Jun 2003
Posts: 9,225
Charleston
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sixpackgut Offline
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sixpackgut  Offline
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Joined: Jun 2003
Posts: 9,225
Charleston
You can buy flexplate from mancini for $70. With one of my torque converters i needed to make a spacer, changed converter than didn't need a spacer. Changed trans and another converter and didn't need a spacer. Mock it up outside the car first

Last edited by sixpackgut; 05/18/18 02:32 AM.

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