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Flex Plate ID
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SC397 View Drop Down
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    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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carnuck View Drop Down
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Points: 1432 		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: 1456 		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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american hellbilly View Drop Down
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Points: 148 		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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american hellbilly View Drop Down
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Points: 148 		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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SC397 View Drop Down
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The flex plate will only line up one way with the holes in the end of the crank.  You have to put it on the crank and keep spinning it around until all the bolt holes line up.  The flex plate goes on the crank shaft first, ring/washer goes on the flex plate, the bolts go through the ring/washer then through the flex plate.
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Points: 148 		Post Options Post Options   Thanks (0) Thanks(0)   Quote american hellbilly Quote  Post ReplyReply Direct Link To This Post Posted: Dec/23/2011 at 12:28pm
How do I figure out which hole is the offset hole on the crankshaft? Does the ring/washer go between the flywheel and crank or flywheel and trans
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SC397 View Drop Down
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Dish away from the engine
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Points: 148 		Post Options Post Options   Thanks (0) Thanks(0)   Quote american hellbilly Quote  Post ReplyReply Direct Link To This Post Posted: Dec/20/2011 at 5:07am
I am reinstalling my flywheel on my 77 360/TF904 and was wondering which direction the flywheel goes. dish in or out?

Edited by american hellbilly - Dec/20/2011 at 5:09am
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Points: 1432 		Post Options Post Options   Thanks (0) Thanks(0)   Quote carnuck Quote  Post ReplyReply Direct Link To This Post Posted: Sep/13/2011 at 11:22pm
Originally posted by SC397 SC397 wrote:

On the left is a flex plate for a 360 with the TH400.  On the right is a flex plate for a 401 with the TH400.  No weight on the 360 (except for the little round riveted tubes) and a 1' x 2 1/4" weight on the 401flex plate.



Just to go a little further with this. These plates are for '74 to '79 TH400. (the earlier one used with a nailhead trans and adapter ring is different) The "mustache" cut out of the plates IS the balance weight! On the 6 cyl it's cut out all the way. The 401 plate was rebalanced from a 360 plate. The actual factory 401 plate has a very skinny mustache without the "undernose" divot. 304 flexplate has a bigger mustache (smaller weight offset)

304 flexplate to TH400 (almost brand new)



Here's the TH400 to 327 flexplate on the motor



and the adapter ring
Pics http://tinyurl.com/jimsclads
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