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Flex Plate ID

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american hellbilly View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote american hellbilly Quote  Post ReplyReply Direct Link To This Post Posted: Dec/23/2011 at 12:53pm

Thanks for the info.

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american hellbilly View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote american hellbilly Quote  Post ReplyReply Direct Link To This Post Posted: Dec/24/2011 at 10:26am
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote SC397 Quote  Post ReplyReply Direct Link To This Post Posted: Dec/24/2011 at 11:05am
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote carnuck Quote  Post ReplyReply Direct Link To This Post Posted: Dec/24/2011 at 9:19pm
The TH400 has 3 converter bolts and the 727/9XX have 4
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SC397 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SC397 Quote  Post ReplyReply Direct Link To This Post Posted: Aug/25/2012 at 11:50am
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote raysinvegas Quote  Post ReplyReply Direct Link To This Post Posted: Jul/28/2013 at 12:19pm
Originally posted by mopar63 mopar63 wrote:

just wondering if you guys can help out before I go to far with this, pulled out my 343 last night, I'm putting in a recond 4v 290, the flexplate I have with the 290 has 6 holes  and is smaller than the old 343 one which has 4 holes ,luckily I got the convertor with the 290 and it seems to go into the 343 trans ok ,looks like both transmissions I have are M11's, question, are the 290 converters supposed to be smaller by a few centimetres  in diameter?if all seems right I'll keep on moving with the transplant,cheers
 
I'm having a similar issue. Did the 290 ever come with an M11? Can I bolt the 290 and M11 together with the flex plate and converter from the M40?
Andy Ray
64 440H
64 440 Convertible
68 Javelin SST 343
69 Javelin SST 343
69 SC/Rambler
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Post Options Post Options   Thanks (0) Thanks(0)   Quote carnuck Quote  Post ReplyReply Direct Link To This Post Posted: Aug/01/2013 at 1:36am
I noticed some of the pictures (including mine) disappeared from this thread.

I have a 290 flexplate from a '69 but what is the (30) quotation below about?



NOTE:
Is the early 6 cyl the same bolt pattern as later ones? I need to balance the nailhead TH400 flexplate for my 290 from the flexplate above and need something zero balanced to do it (early crank would work) Otherwise I will have to drill the center hole out and ruin a perfectly good 290 plate.


Originally posted by PHAT69AMX PHAT69AMX wrote:

AMC Flexplate Part Numbers from 1967 thru 1972 Parts Catalog F-14072 R3
 
Group 16.035-1   PLATE, Automatic Transmission Converter Drive
 
67/71 ... SIX ..................... 319 1958
72 ...... SIX ..................... 321 4087
67/69 ... 290 (Except 30) ......... 318 4502
68/69 ... 290 (30) ................ 319 2342
70/71 ... 304 ..................... 319 6876
72 ...... 304 ..................... 321 4088
 
67/69 ... 343 ..................... 318 1750
70/71 ... 360 ..................... 319 6874
72 ...... 360 ..................... 321 4089
68/69 ... 390 ..................... 319 1125
70 ...... 390 (E/MACHINE) ......... 319 6874
70 ...... 390 (MACHINE-* 16-37) ... 319 6874
70 ...... 390 (MACHINE-* 16-38) ... 321 0063
71 ...... 401 ..................... 321 2351
72 ...... 401 ..................... 321 4090
 
16-37 ..... On 1970 (390) used prior to Engine Build Code Number 210Y10
.................... and beginning with Engine Build Code Number 212Y10
 
16-38 On 1970 (390) used beginning with Engine Build Code Number 210Y10
.......................... and prior to Engine Build Code Number 212Y10
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SC397 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SC397 Quote  Post ReplyReply Direct Link To This Post Posted: Mar/12/2014 at 8:16pm
Here is the V8 904/727 flex plates all lined up.  Note that in a earlier post there is a second version of the 304 flex plate with a curved weight.
The dimensions of the rectangular weight version for the 304 is 1"x 2 3/4"  the 360 weight is 1"x 3 1/8" and the 401 weight is  larger curved one.
The 6 cyl flex plate not pictured has no weight at all.


Edited by SC397 - Mar/16/2014 at 7:54pm
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PHAT69AMX View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote PHAT69AMX Quote  Post ReplyReply Direct Link To This Post Posted: Mar/13/2014 at 9:40am
carnuck,
 
The (30) notation indicates which "Series" the part and part number applies to or not.  "Series" being "Model" in AMC speak I reckon.  Series "30" was the AMX.  The 1st digit of the "Series" number is reflected in the 4th digit of the VIN and also shows up as the 2nd two digits in the "Model" Number stamped on the door tag, preceded by the 1st two being the model year.  They go over it in the '69 TSM in Section 16 on page 16-4.
 
Unaware why the 290 in the AMX would have a different Flexplate than the one used with the 290 in other models.


Edited by PHAT69AMX - Mar/13/2014 at 10:10am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote raysinvegas Quote  Post ReplyReply Direct Link To This Post Posted: Mar/13/2014 at 10:19am
The 290 in the AMXs was the ONLY 290 that was bolted to a cast iron BW M11. That flex plate is nearly impossible to find as there were only about 300 290/auto AMXs built.
Andy Ray
64 440H
64 440 Convertible
68 Javelin SST 343
69 Javelin SST 343
69 SC/Rambler
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