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Flex Plate ID
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american hellbilly View Drop Down
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Joined: Aug/13/2008
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Points: 150 		Post Options Post Options   Thanks (0) Thanks(0)   Quote american hellbilly Quote  Post ReplyReply Direct Link To This Post Posted: Dec/23/2011 at 1:53pm

Thanks for the info.
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american hellbilly View Drop Down
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Points: 150 		Post Options Post Options   Thanks (0) Thanks(0)   Quote american hellbilly Quote  Post ReplyReply Direct Link To This Post Posted: Dec/24/2011 at 11:26am
Ok I have two more questions... Will the flywheel bolt on backwards, or is there only one way for it to bolt up? I was half awake when I asked the direction and turned my brain around, Does the counterweight go inside or outside? That is what I should have asked in the first place. I'm asking because I can bolt it straight up with no issues with the counterweight facing out.
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SC397 View Drop Down
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Points: 1492 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SC397 Quote  Post ReplyReply Direct Link To This Post Posted: Dec/24/2011 at 12:05pm
You are in luck, it is hellbilly proof!  No, you can not bolt the flex plate on backwards.  (I just tried it)  There is no position where all of the holes will line up when it is flipped the wrong way. 
The counter weights on the 904 & 727 are on the side that faces the transmission. 
The counter weights on the TH400 and Borg Warners face the engine side.
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carnuck View Drop Down
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Points: 1459 		Post Options Post Options   Thanks (0) Thanks(0)   Quote carnuck Quote  Post ReplyReply Direct Link To This Post Posted: Dec/24/2011 at 10:19pm
The TH400 has 3 converter bolts and the 727/9XX have 4
Pics http://tinyurl.com/jimsclads
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SC397 View Drop Down
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Points: 1492 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SC397 Quote  Post ReplyReply Direct Link To This Post Posted: Aug/25/2012 at 12:50pm
Here is a 343 flex plate along side a 1970 390 flex plate for the M11/M12 Borg Warner Automatics.  The weight on the 390 flex plate is .213" thick x 3.75" long x 1.375" tall.  With the exception of the one torque converter mounting hole, the series of holes were put in there from the factory to balance it to the crank.  All AMC engines were individually balanced.  If you are swapping flex plates, flywheels or, vibration damper, (even on the same displacement engine) the assembly should be re-balanced.
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